Taking a Knife to Brand New Frames to Build the World's Lightest 29ers

Dec 5, 2017
by Gustav Gullholm  



By the end of the 2016 season, I thought it was time to start looking for two new cross country bikes. Scott had just released their new Scale and Spark models, and coming from an old Scott Scale SL, this was a natural choice. Having a look at the weight I did some rough calculations based on previous experience and the components available at the time, and it seemed possible to build a hardtail below 7kg and a full suspension bike close to 8kg. The project's countless delays and months of waiting meant spare time - Spare time to think about ways to take these projects even further.

I'm sure many can relate to the phrase: "Well... That escalated quickly!" when it comes to building bikes. Here we are, a year later with the lightest 29ers ever built. But first, to get a few things out of the way:


Some Disclaimers

No, these bikes are not for everyone. They have a 85kg / 187lbs rider weight limit.
No, they are not dentist bikes. In fact, they are so expensive that most dentists would complain in the comment section.
No, they are not show bikes. They are used for daily training, racing, and lots of fun.
Yes, you could probably break them "at your local trail." They are purpose built XC and marathon bikes.
Yes, the stems are long and the drop is big. This is how I want to sit.
Yes, Furious Fred tires are the worst. But, they are there for comparison and to show what's possible.


The Building Process

After the frames were ordered from Scott, a lot of time was spent on research about what was available, and to come up with my own ideas and having them realized. The goal from the very beginning was to build super light, but without compromising strength and durability too much. The hardtail needed a real fork with lockout. Same thing for the fully, and both needed a big cassette and chain ring. They would have to be usable, and hold up to both training and racing. Another important goal was to keep them looking like normal mountain bikes. Along with that, a big part of the fun with building bikes is making them look great.

2017 Scott Spark 900 SL and Scale 900 SL
When you really hate orange...
Warranty already void...

Putting a knife to brand new frames worth €10.000 is a strange feeling to say the least. But, I don't really like orange. Most of the paint and primer was removed using knifes, then I sanded off the rest, finishing with finer and finer grit paper. As many of you know, the paint serves as UV-protection for the carbon resin. So after this the frames are regularly treated with UV-protective wax. A good thing that comes from this, is that raw carbon is a lot harder than paint, so after being waxed, the surface becomes extremely slippery. Dirt practically falls off by itself. Stripping carbon frames is not difficult work, but very time consuming. More than 90g per frame was a good saving though, and well worth the slightly traumatic experience. Using carbon derailleur hangers and cable ports from Hopp Carbon Parts dropped the weight even further.

Fox 32SC paint stripping in process.
World s lightest 29er
Paint removal, followed by sanding and polishing.

For the Scale, the fork was stripped of paint, then the lowers and crown were sanded and polished. The magnesium lowers require some maintenance to stay shiny, it depends a lot on what environment the fork sees, but to stay shiny, a polish at least once a month is required.

A ShiftUp Light Cartridge was installed, it features only lockout and is custom tuned for each rider, along with their carbon axle. Air cap and volume spacer from Hopp Carbon Parts. All this brought the weight down to 1239,4g.

World s lightest 29er
World s lightest 29er
36,5g vs 15,9g carbon hardware. Tuned Twinloc remote.

For the Spark, not much was done to the fork, but a lot of work was put into the remote system. The Scott Twinloc remote is used to control both front and rear suspension, and already is quite light. But, by modifying it to a matchmaker mount, along with some other tuning, the setup got even lighter and also cleaner looking. All connections were then made to work with PowerCordz housing and synthetic fiber cables, which is also used for the shifting system.

XX1 - now 197g with some more carbon. Starting weight - 245g.
197g and still going strong after almost 2000km.

While a Shimano derailleur is slightly lighter, I like the ergonomics of the SRAM shifter a lot better. So XX1 was the obvious choice, but with a starting weight of about 245g there was a lot of work to be done. Thanks to a new inner cage plate and pulley wheels from Extralite, a parallelogram from Hopp, and a good deal of old-school Dremel work by me, I got the weight down to 197g. It could actually be a lot lighter by using more carbon parts, but this was good enough for the Spark.

World s lightest 29er
World s lightest 29er
The Acros AGE rear derailleur.

For the Scale however, where I really wanted to push the limits, I got a Acros AGE hydraulic shifting system. First of all - it looks amazing. All that CNC-work actually is a quite refreshing look for a derailleur. To match all the other polished parts, it was disassembled and stripped of anodizing. Performance wise. this system was actually one of the best surprises in a long time. Ergonomics are great and the shifting is extremely distinct and precise. Without doing any tuning, the weight of the complete system is just 281g.

31 6x400ish one piece combo at 161 9g
Custom made by Berk Composites

To save some more weight and make for an even cleaner looking setup, the Scale got a one-piece seat and seat post combo. It weighs just 161,9g and could have been made lighter still by bonding the seat directly to the post without using rails, but I prefer to have the added flex for comfort. Believe it or not, a carbon seat with no padding can actually be really comfortable. I'm waiting for some puns about this in the comments though...

MCFK stems with Schmolke TLO handle bars. -6 90mm 720mm 186 5g -17 100 720mm 188 5g Now delivered to Mattias Hell re at Experimental Prototype to be bonded into one-piece combos to shed a few more grams and probably improve the stiffness a little bit.
179 7g
When light just isn't light enough: Bonded handlebar and stem (right).

The handlebars are Schmolke Carbon TLO in 720mm width with MCFK carbon stems. These already are some of the lightest combos you can get, but I let Mattias Hellöre bond the bars directly to the stems to save another 10g per combo. And almost as important, it looks extremely clean. Weight is just 174.0g for the 90mm, and 176.5g for the 100mm extension.

Other components

I could go into details and pics with pretty much every single thing on these bikes, but to sum up the rest:

• Custom made silver Extralite hubs, hand sanded and polished; Sapim CX Super spokes; and sanded 77Composite clincher rims make for a 1086,8g wheelset.
• For the second wheelset, the same hubs and spokes are used, but laced to DT Swiss XRC950T tubular rims - 1169,3g for the set.
• Trickstuff Piccola brakes are used for both bikes. One set in custom silver. Light but extremely powerful. Much better than, for example, Shimano XTR.
• Chainrings from Garbaruk Components, with the one for the Tune cranks being custom made.
• Bolts, axles and headsets from Extralite.
• The rider weight limit of 85kg is set by the pedals, seat- and handlebar-combos. The clincher wheel set has a 100kg limit and the frames a 125kg limit.



Result: Scott Scale RC 900: 6.22kg/13.71lbs

6 22kg 13 71lbs with pedals. Worlds lightest 29 mountainbike. Check my Instagram for more. https www.instagram.com dangerholm
World s lightest 29er

6 22kg 13 71lbs with pedals. Worlds lightest 29 mountainbike. Check my Instagram for more. https www.instagram.com dangerholm
6 22kg 13 71lbs with pedals. Worlds lightest 29 mountainbike. Check my Instagram for more. https www.instagram.com dangerholm


Overall Weight Vs Tire Selection:

• Schwalbe Furious Fred LiteSkin - 6.22kg / 13,71lbs
• Schwalbe Rocket Ron LiteSkin - 6.59kg / 14,53lbs
• Schwalbe Rocket Ron SnakeSkin - 6.73kg / 14,84lbs
6 22kg 13 71lbs with pedals. Worlds lightest 29 mountainbike. Check my Instagram for more. https www.instagram.com dangerholm

Views: 10,248    Faves: 10    Comments: 5




Result: Scott Spark RC 900 SL: 7.33kg /16.16lbs

World s lightest 29er
World s lightest 29er

World s lightest 29er

Worlds lightest 29 FS Scott Spark RC 900 SL custom everything Thunder Burt 2 1 LiteSkin 7473 3g Rocket Ron 2 25 LiteSkin 7701 7g Rocket Ron 2 25 SnakeSkin 7841 7g Tubular DT Dugast 7862 1g Follow on Instagram for more https www.instagram.com dangerholm

Overall Weight Vs Tire Selection:

Schwalbe Furious Fred LiteSkin - 7,33kg / 16,16lbs
Schwalbe Rocket Ron LiteSkin - 7,70kg / 16,98lbs
Schwalbe Rocket Ron SnakeSkin - 7,84kg / 17,28lbs

Views: 7,221    Faves: 9    Comments: 6



Riding the World's Lightest 29ers

First of all, it's one thing to imagine lifting a bike this light and something else to actually have it in front of you. I could've made a compilation video with peoples facial expressions and comments when they got to lift the bikes, just for laughs. Everyone knew the weight, but was still more or less in chock feeling how light they really are. Same thing goes for riding them. A good friend took the Spark for a ride, and his first comment was that it was more like accelerating on a high end road bike than on a mountainbike. He even noticed how the steering felt lighter. Generally a 10kg fully is a light and great bike, but this is a different kind of beast. Same thing goes for the Scale.

The one word I would use to describe the ride characteristics is responsive. Low rotational and overall weight makes technical climbing a lot easier, and same thing in for example race situations like having to accelerate hard out of a corner to keep up with a rider in front of you. And of course the low weight helps on long climbs as well. They are simply very enjoyable bikes.

You might think that these bikes would be super nervous going downhill, but actually not. A cross country bike will always be less confidence inspiring than a trail or enduro bike, but this comes down more to geometry than weight. And having that seat a mile high in all situations. The Scale and Spark is a good chassis, and especially the Spark with its relatively low bottom bracket really rides quite well going downhill too. So just for fun I put some flats on it and a dropper, and took it to the bike park one afternoon. No explosions of carbon, no issues.
When you put a dropper and flats on your 8kg fully and hit the bike park for some freeracing
bigquotes...The Spark, with its relatively low bottom bracket, really rides quite well going downhill too. So, just for fun, I put some flats on it and a dropper, and took it to the bike park one afternoon. No explosions of carbon, no issues.

Although the bikes was just recently finished (if they ever truly will be...) the Spark has already been ridden almost 2000km and the Scale a bit less. So, most parts are already very well tested, since I always had some version of one bike up and running. The only parts not yet ridden are the handlebar combos and the seat/seat post combo. So with both bikes finally complete, I'm really looking forward to the 2018 season, to forget about building and just ride the shit out of them.

What's next?
Not much, except riding. Could they be made lighter? Yes, about 200g for the Scale and even more could be dropped on the Spark. Since the project has taken so long to complete, a few new and lighter options are available like for example rims. Also more tuning work could be done, like having the Acros system made fully out of carbon by Hopp. But, with new wheels and so on, this would be some stupidly expensive 200g to save, So, without any sponsors or partners, this will be it for now.

So a long, cold and dark Swedish winter without any project at all? Of course not, soon a 2018 Scott Genius Tuned frame set will arrive. It won't be fully focused on weight, but should still be a pretty cool build with some custom work. Feel free to have a look at my Instagram to keep up with that project and to see more of these bikes in action next year. And also it might help explain the shorts and flat pedals. Cross country could use some more rock'n'roll and hopefully there'll be a lot of laughs along the way.

Warning: most of these modifications will void your warranties. If you think the polished fork looks awesome, remember that you will need to keep polishing it or else it will oxidize and turn matte. Also, stripping a frame will take longer than you expect, so don't blame me when you want to give up. And most importantly, remember to read Pinkbike and listen to Motörhead on a regular basis. - Gustav Gullholm


World s lightest 29er



280 Comments

  • + 356
 Just want to give a thanks to Pinkbike for actually posting user generated material like this. And for RC who edited my original blog post that looked like it was made in Paint.
Just a regular guy and PB user since 2003, and it's honestly been my main news source ever since (and the comment section is always hilarious of course), so it's both surreal and awesome to see an article about my own work on the front page!

And thanks for all the comments, seriously! Neither me nor my pedal pistons are used to this kind of attention. lol
  • + 2
 do you weight 85kg tho?
  • + 3
 Hi, it's really great work on the bikes, can I ask you a question, did you think about rear shock DT swiss XR carbon, I know it works different from FOX but could save some 100g compared to FOX I think, what do you think?
Thanks
  • + 18
 Props on the nice work, and double-props on the slightly-tongue-in-cheek commentary. I liked the "dentists would complain about the cost" bit.
  • + 3
 Great stuff! I love Acros components, they are like works of art!

I know these two steeds are expensive, but out of curiousity, how much did each really cost to get to this level?
  • + 10
 @JoseBravo: Actually I'm just 75-76kg or something in that pic. Skinny build and small joints, add some quads to that and maybe I look a little heavier from som angles haha. In the winter when I hit the gym more often I usually hit 80kg or a bit above. Was measured to 5,5% body fat in May, but it's a bit higher here.
  • + 3
 @FernandoRV: Thanks! As for the XR Carbon, it's not available in Trunnion mount to fit this frame, and also I really like the performance and 3-position adjustment on the Fox. I really use the Twinloc all the time.
  • + 3
 Wow! Good to see this posted in PB.. I've been following your thread @ weightweenies forum. Awesome stuff. Thanks!
  • + 2
 @twozerosix: Haha I hoped you guys would like it. And it's funny because it's kinda true.
  • - 4
flag dogui (Dec 5, 2017 at 17:48) (Below Threshold)
 Why dont you try with a Lauf fork. 890grs and 60mm of travel.
  • + 2
 @bicyclerider: oh forgot to mention also triple props on the highly competent and original photography...the hardtail hero shot especially on the reflective ground plane.
  • + 1
 Nuts!
  • + 8
 This was a cool article to read.
  • + 7
 "just a regular guy"

ya, ok.
  • + 1
 Sexy legs.
  • - 35
flag Enduro27 (Dec 6, 2017 at 12:15) (Below Threshold)
  • + 1
 @dogui: Because he probably want's a suspension fork...
  • + 182
 Your attention to detail is incredible! I can’t imagine how easy acceleration and distance riding is on something this light. I can’t see how anyone would pick holes in these builds, all the spec sounds functional and well thought out indeed! Very well done sir Salute
  • + 35
 Well, no dropper Wink

I'm kidding, those bikes are insane dude congrats, and the attention to detail like rAtty says is insane Salute
  • + 17
 @rAtty-c Thanks a lot, appreciate it! Yeah I really wish more people got to try the bikes, it's quite the experience and most of all - so much fun.
  • + 28
 @Scotj009: What can I say, I like living on the edge... of going over the bars all the time. Wink Thanks!
  • + 65
 before anyone in pinkbike is allowed to criticize in any way, they have to prove they can table as well as this guy on a bike with less than 150mm of travel!
  • + 1
 Theres always a lighter build
  • + 51
 @Scotj009: Sick prototype 149.9mm travel Boxxer you've got there.
  • - 2
 One word: AERO. Hate to put another bug in the head of someone manifestly more OCD than myself, but you've left no stone unturned on gram savings that shave a few seconds off the climbs, only to throw away a good portion of that savings w/ uncut race plates, baggy cotton shirts, & a non-aero helmet?
You've clearly accomplished your mission as weight-weenie, but if your greater goal involves adding *speed* then you're missing some very low-hanging fruit!
  • + 5
 @bicyclerider: You're about as stripped down as your bikes. Holy shite.
  • + 5
 @Veloscente: He's right anything over 10mph benefits from aerodynamics
  • + 0
 @hamncheez: hey you changed it!
  • + 13
 this is freaking awesome! I can't wait to get home and fire up the belt sander!
  • + 19
 Weight Weenie Level 10,000. * Runs away from terminator thighs*
  • + 2
 @powderturns: Believe me, I looked at that belt sander more than once...!
  • + 1
 @Scotj009: what did I change?
  • + 7
 Coulda saved half that weight shaving your beard off Big Grin
  • + 3
 @hamncheez: to be fair it's probably easier to table on a 17 lb bike Wink . But for real, super light bike, looks fit as hell, and has skills. Sounds like the ultimate racer.
  • + 1
 @hamncheez: yeah but in the table pick he’s on flat peddles, when did he go to clipless, Daisy Dukes and cheetah tights?
  • + 1
 @hamncheez: it’s not the table that is the hard part, it’s the landing without snapping it in 2.
  • + 6
 @bicyclerider: This is great! I work for SCOTT USA I will definitely be passing this story along tomorrow. Nice work
  • + 7
 @Jamesb15uk: He's like Floki from Vikings but instead of building ships he builds really light XC bikes
  • + 2
 @nmcmillan: Thanks! And just let me know if you ever would need any high-res images or such.
  • + 2
 @bicyclerider: Will be cool to see what you do with the geniusSmile
  • + 1
 @thestraightline: try to put more cables and junk on the handlebars.
  • + 92
 Yes, you could probably break them "at your local trail." They are purpose built XC and marathon bikes.


*Gets pic throwing a fat table *
  • + 14
 At first I was like "what kind of rider tempts fate like that?" then I was like "damnnnn"
  • + 54
 Funny thing is that it actually was a really harsh landing too, since it's more of a fly-out into a long slope than a regular jump with landing. And had to do it a few times to get the pic right haha... Oh well, I take good care of them but they're bikes - not museum pieces.
  • + 1
 looks solid but of course it's in the longterm that everything is going to fell apart, but amazing challenge
  • + 79
 Look at those pedal pistons my god
  • + 7
 Yeah he should be making his bike heavier, he could probably beat me pedalling a dh bike!!
  • + 7
 got to be heavier than 85kg max rider limit! or just guidelines only....
  • + 1
 @yeti-monster: thats what I was thinking too.
  • + 32
 He's had his bones removed and replaced with hollow carbon versions.
  • + 28
 @slickwilly1: Believe it or not, but I once used to ride a 20kg Spesh BigHit with 24" rear wheel, Sun Ringlé DoubleWides and Nokian Gazzaloddi tires... Please don't tell anyone though, might ruin my good weightweenie reputation!
  • + 28
 I like to think those jeans were full length before the ride.
  • + 77
 Bet you they would be lighter if he used 26"
  • + 57
 There is always one
  • + 4
 my thought exactly, or stronger
  • + 3
 haha this is the first thing I though - would have been about 5kg with 26" :-P
  • + 4
 I invite you to follow those steps :
1 - Ride a 26" XC
2 - Ride a 27.5" XC
3 - Ride a 29" XC
4 - Read your comments again
  • + 10
 @qreative-bicycle: it's not about the ride, it's about the weight
  • - 6
flag qreative-bicycle (Dec 6, 2017 at 1:00) (Below Threshold)
 @ctd07: I got the point yes but it's so easy to say that, just like it might be even lighter on 20" wheels.
It has to be light but it has to be a good ride too, balance is essential. Here he didn't compromised the rolling capability and even improved the handling. 26" suck on roots sorry...
  • + 10
 @ctd07: My son's Commencial is around 3.5 kg brakeless and with a rear 140 mm disc and Deore brake still below 4.

I showed him this Scale and he wasn't overly impressed. Also, he noticed that there's no bell on the handlebar. What kind of bike doesn't have a bell!??
  • + 4
 @pakleni: exactly! Calling bs on ANY commencal weighing less than 15kg though lol
  • + 1
 29" is so fckin rad for long distances rides .... just try, you wont be able to stop
  • + 2
 It would have been lighter on 16" wheels. Just saying...
  • + 2
 @qreative-bicycle: My only bike is a 26" XC. I ride DH. It sucks balls
  • + 1
 @qreative-bicycle: exactly ... horses for courses. 29" for long XC rides and 26"for DJ and pumptrack
  • + 1
 @ctd07: meta sl1 12.7kg but more like 13.2 with pedals. mine is 13.7 with a dropper. but yep thats about as light as a commencals get. not exactly the lightest bikes but for an aluminium 2013 bike i love it.
  • + 43
 Those bikes are not my cup of tea but holy crap was this impressive. While the final product is awesome, the attention and dedication to detail screams passion. Most articles I skim; I read every word. Keep it up! I look forward to your next project.
  • + 15
 @Grew Thanks, really appreciate it! Only took like 7 months longer than planned haha, but worth it in the end.
  • + 42
 you would have to add weight just to race this in a UCI road race... fuck that's impressive.
  • + 26
 When carbon everything, electronic shifting and 1x happened i was a little concerned it'd be the death of old-school spreadsheet-loving DIY weightweenieism but i'm so glad to see the practice is alive and well! great write-up
  • + 3
 Thanks, I try to do my best! It's alive on a few European forums, but you don't see much of it. Roadies has kept the spirit alive quite well, but aero and discs have made the really light bikes a lot more unusual.
  • + 28
 Will never own one, but so cool to see whats possible. Thanks for sharing this.
  • + 4
 exactly my thoughts !!
  • + 1
 @Lagr1980: Great minds think alike I guess!
  • + 27
 Wait, do WE hate carbon this week or not? Where did all the paint and carbon sanding go? Do we still hate dentist and drive Tacoma’s? So confusing.
  • + 28
 Pure porn! The bikes are nice too!
  • + 15
 Leg show...jeeeesus
  • + 5
 @jrocksdh: Tons of squats super setted with Bulgarians and wall sits to complete failure coupled with a lil bit of HRT does the trick!
  • + 1
 @bohns1: thanks
  • + 11
 @bohns1: Squats and bulgarians is actually spot on! 7 years of that and like a million meals served in tupperware...
  • + 4
 Dude! What’s your 20 minute watts/kilo? Those legs are huge!@bicyclerider:
  • + 3
 @moose-tastes-good: I got no idea honestly, never done any tests at all or even used a powermeter! Maybe next year, would be fun to know.
  • - 1
 @bicyclerider: and some good ass supplements.. I've been at hit hard for 5 years.. Time to take shit to the next level.. Ehmm!
  • + 2
 @bicyclerider, if only you knew someone in the same town as Quarq... If only...
  • + 1
 @whattheheel: If only... Sigh, one can always wish...
  • + 1
 @bohns1: hormone replacement therapy??
  • + 2
 @bicyclerider: Text already sent... We shall see!!
  • + 20
 Bloodletting to get the weight down, thats hardcore.
  • + 17
 this has got to be the most positive comments section i've ever read ! The bikes are awesome too.
  • + 9
 haha that's because OP has basically eliminated 3/4 of usual comments by his 'disclaimer' section. well done tho!
  • + 14
 You forgot to sand off the kashima coating. I hear that weighs a ton! Just kidding. Awesome builds and looks like a gnarly fast ride
  • + 4
 give it time, they sometimes do that by themselves! (or maybe thats just because where i'm from bike maintenance is unheard of among the dirt roadies)
  • + 8
 I was able to demo Cannondale's flagship Habit, a full sus, carbon everywhere bike. Riding trail bikes this light is such an amazing sensation. You're friend saying its like riding a road bike is accurate. The fun thing for me with that weight is you just wanna ride the bike til you're exhausted. So much less effort. A fascinating read. Please, at some point, don't hesitate to go over everything.
  • + 2
 @mashira Thanks for that comment, I fully agree with what you say. Might do an even more in-depth write up, otherwise I've been thinking of maybe doing a few videos going through all the nice little details and facts about the bikes. I'll post it here and on my Instagram account.
  • + 1
 @bicyclerider: Sweet. I'll keep an eye out. Hope you win some races!
  • + 9
 Many don't like or understand the weight weenie game, but I think it's awesome. Great work on those bikes. I would totally ride that Spark!
  • + 6
 Dear @pinkbike, I love your website. But please consider all the readers who use touch screens and exit the article every time they click on picture when accidentally scrolling down.

4 times alone on this article!

Cheers
Craig
  • + 5
 Someone who understands the value of weight vs strength vs aesthetics. This bike is made for purely for XC and nothing more with that in mind he's done a DAMN good job!

It looks so professionally done, people are going to be calling up Scott asking about his model Scale and Spark only to come to find out that Scott doesn't have these specific bikes as they were custom done. haha

Now, back to my heavy over weight Scott Genius Smile
  • + 2
 @LiquidSpin Thanks, really. A lot of time spent balancing those three, so it's good to see people appreciating it!
A little bit envious about that though, my Genius frame set is still a month away and the bike won't be finished until spring. Can't wait though!
  • + 1
 @bicyclerider: you also have a Genius coming your way?! Another project in the works? Please please keep us posted ~

I'd be super stoked to see what you can achieve with the all the Genius as well!
  • + 4
 @LiquidSpin: Yeah, a 2018 900 Tuned frame set. Got many ideas but so far the only thing ordered is a set of Next SL cranks with Garbaruk chain ring and a set of Trickstuff Direttissima brakes. Gonna be good though!

I'll be uploading pic on my user profile here, and of course you can follow me on Instagram too.

Had a look at your Genius now, good looking bike man!
  • + 1
 @bicyclerider: ill follow u o pinkbike since I don't use Instagram. Damn, you are one lucky rider!

Thanks for checking out my ride as well it's a respectable 26.06lbs for a 150mm full suspension bike but if I had the extra loot I could drop it down to 25ish pounds if I swap out the cranks for a RF Next SL and a lighter weight cassette like the e13 9-44t cassette. But for now I'm happy with the current set up.

Definitely can't wait to see your new Genius project!
  • + 1
 @bicyclerider: Awesome projects mate, they look great. For the genius: To dropper or not to dropper?!
  • + 1
 @Altron: Dropper for sure. The question is, Fox for matching Kashima and regular trigger lever - or Magura for cleaner set up (no cable) but all black and not as easy to use.
  • + 1
 I would wait a while on the Magura. I had first gen and it took soooo long for it to do it's job. Hovering above the bike and waiting for that mechanism to close before you could sat down sucked. I hear they have a newer version out now that I have not tried and it's to be supposed to be faster but I would still give them time. I want to like it tho!! Hitting that tiny button on the remote was so easy!
  • + 1
 @bicyclerider: Fox Transfer all the way~
  • + 4
 Been following you on Instagram for ages now, absolutely love this kind of attention to detail with a build and have been wanting all this detail on the bikes summed up - your attention to detail even covered addressing the PB trolls in your disclaimer, so no one can criticise! I love the fact that even the super light, rare parts have then all been modified further, so it's truly one of a kind and no stone has been unturned!
  • + 1
 Thanks a lot!
  • + 4
 Huge props @bicyclerider,that's awesome work!
I'll never forget the day I picked a 4700gr Look road bike from the floor...the feeling was like when you pick up a box that you think it's full and it's empty. Mindblowing.
  • + 3
 Those builds are bonkers !
Despite being more of an enduro guy I'm a weight weenie at heart and I can spend hours figuring what the lightest build would be! Here are some thoughts that might have to be taken with a grain of salt as weight is not the only factor:
- why go for a Scott scale instead of an FRM Anakin? ( I believe the frame + seatpost + stem + headset comes at 950g)
- AbsoluteBlack manufactures absolutely porntastic components. Honestly the hottest CNCed chainring I have ever seen ( and I have a kcnc spiderweb) and the lightest disc rotors i know( ~40g I believe).
- If you're really going hardcore, the german A.Kilo is a fork that weights ~1.0kg (suspended).

But here the bikes are absolutely stunning and remind me of that insane build Scott had on display when they introduced the then new Genius. Big up for the Schmolke, Trickstuff and Acros component! ( Still don't understand why hydraulic shifting never took off). You sir are a hero.
  • + 1
 @polarproton Thanks!
- The FRM seems like a good frame but the Scott is actually lighter. Also I prefer the looks of the Scale.
- Had a look at Absolute Black for sure, especially since they used to make the DM chain rings that came stock on the Tune cranks sets. I really like the design of the Garbaruks though, and they were super helpful.
As for the disc rotors, unfortunately their 160mm isn't 40g. The ones I use on the Scale are a pair of old Ashimas and about 65g each. They can be a bit sketchy but the Trickstuff brakes really are that powerful and easily lets me get away with running them.
- Tried to research German:A but it was hard to find reliable information about it. Weight seemed to vary a lot, and if you want the Lockout option it becomes almost around the same weight as my tuned Fox. Really wanted to go with a polished for too.

Agreed on the part about the hydraulic shifting. Of course it's expensive, but so good that I kinda want a set for the Spark too but not available anymore. Once again, thanks for your questions and comment.
  • + 1
 @bicyclerider: on the last pic, the "legs" one, LOL, I can see that the brake hose is torn. Was it an accident? Or were they "too much Tuning"?
Great work, You proved lots of stamina in the process
  • + 1
 @vhdh666: Yeah crashed going close to 30km/h, so had to ride the remaining 60km like that haha. The bars must've twisted somehow and it got ripped off up at the lever, so was just a "shit happens" situation. Thanks!
  • + 2
 it would have been so nice if a big brand as sram bought the technic instead of that acros did it (acros isn't the designer of the system). the system is so expensive because its so much cnc and so smal batches when they make them. Bigger brand and bigger batches in inc or even forge the parts, and i´m sure they could make it near or the same as a xx1 atleast.
  • + 1
 @baltazar: Indeed the design originated from 5-rot looong ago ( as a 3x9 ) .
I think all this is patented, acros buying the then startup meant they got away with the tech. Though, i have no clue how it shifts on terrain but the triggers are the best I got my hands on! I believe they even used to make it in different colors, like the old x-0 group.
  • + 5
 My Orange Alpine 160 us just over TWICE the weight of that!!!! Chapeau sir, chapeau.
  • + 1
 Ha, seems you built a light one then! Never a more stable bike ploughing through rock gardens.
  • + 4
 I love it, absolutely love it. The attention to detail, the component choices and compromises and maybe most of all the action pictures!
  • + 1
 @bicyclerider Honestly curious about your process:

- Where did the 85kg weight limit come from given that these appear to be a bunch of one-off parts especially with all the sanding/polishing?
- How'd you sand through the black paint on the frames and not sand into the carbon since they're both, well, black? Normally when sanding carbon, getting black stuff on your sandpaper says it's time to stop. Did you hit white epoxy behind the paint and above the carbon?

Again, not trying to troll. I ain't gots time for that.
  • + 3
 @feldybikes Those are some good questions!
- The weight limit comes from the ti-axles in the pedals, and both Schmolke Carbon and Berk offer their products in several options, depending on how strong you need or want them to be.
- There was a lot of primer used on these frames, and the primer is clear/white. So quite easy actually. It's just that the tubing really is paper thin in some places, so still felt the need to be extremely careful not to go too deep.
  • + 2
 I sanded a Merida O.Nine couple of years ago for a light SS/comuter build .
I remember it was a lot of work but there was no real risk of damaging the frame. I didn't any machine, only paper and hands though. But as @bicyclerider mentioned the primer and paint are pretty distinctive from the actual carbon, and the carbon is much harder to scrap off than the paint ( goo thing carbon is strong).
Honestly, the first grind was the hardest.
  • + 0
 @bicyclerider: check. Thanks for the info!
  • + 4
 Well deserved front page Dangerholm, you are still sexier than your bikes though Big Grin
  • + 1
 @WAKIdesigns Hahaha laughed out loud at that one! Thanks for your support during these builds though!
  • + 1
 @bicyclerider: Poor Waki and his downvoting troll army that follows him!! Thanks for the chuckle!
  • + 1
 It have been with such joy to follow your progress with these bikes on our swedish MTB-forum Smile And the end resultat is yust amazing!
But don't you thing the reedres here would be interested to have a look at your old weightweenie Trek Session also? ;D

Cherrs // L
  • + 4
 Great read buddy!!!! And as always, amazing bikes!! I can't wait to see the genius!!
  • + 8
 FRONT PAGE BUDDY!!!!!
  • + 6
 @whattheheel: Thanks! For this and all your support during the build, it was well needed at times. lol
  • + 3
 LOL!! And my pleasure! Thanks for sharing the radness!!!
  • + 1
 This was... extremely interesting. I DO have have a question though. What happens when you'll (eventually) crash?
I mean that even by ridding only on dirtroads, you always risk to fall, a slide on your side or something like that.
So,
how all those parts (and the frames) hold up against direct impact on rocks and momma earth?

Thanks.
UncaJohn
  • + 1
 You've got me wondering if you could modify a version of Cannondales Headshok. Maybe go the whole hog and get the 'lowers' made out of Titanium or carbon to try and get the weight to sub 1kg. Be great if you could make one fit into the 1.6mm~ difference dia' of the standard head tube on those with a custom headset.
  • + 1
 @bicyclerider you could drop the weight of the fork by using Xcite Zero forks, their page says they start at 998g for 26 si I guess it's around 1100g for 29er. Tho I have never seen them in person so I have no idea on their performance.
  • + 1
 Why wouldn't someone juat throw so drop bars and use that for a cx race. To me it seems like it would be perfect. I don't understand why people race cx on bikes modeled after a road bike opposed to customizing a super light mtb setup with drop bars. Anyone have any insight into the reasoning?
  • + 3
 All going well until those shorts, faaaark. Seriously though, more stuff like this please Pinkbike, it was an excellent read.
  • + 2
 I've never been a fan of XC and the like, but holy shit, this is just pure porn. Really love how well thought out every little detail is, and mad respect for the time and effort put into this.
  • + 4
 Who laid them bricks?
Stevie Wonder?
  • + 1
 After a 3 pint lunch on a Friday afternoon!
  • + 1
 you don't worry about oxidation fatigue and failures on those forks? i know thats a concern for dudes with racey motorbikes that have forged magnesium wheels if the coating is messed up and the raw mag is exposed.
  • + 1
 @Sweatypants Things like that depend on what kind of magnesium alloy it is I guess, and no worries for this really. There's even raw metal exposed stock (paint is ground off where the rotor bolts could rub, and paint doesn't go all they way up inside the bottom of the forks).
  • + 3
 That is on another level! @bicyclerider your build is insane! I love watching this projects, thanks for the write up
  • + 3
 That hardtail is lighter than what the UCI allows for the roadies... Awesome stuff...
  • + 3
 You managed the lightest AND the sexiest xc hardtail ever. That chrome fox fork is just next level
  • + 1
 @ibishreddin Thanks! Really had a clear image in my head from the start of how I wanted that bike to look, and luckily it all worked out in the end.
  • + 1
 awesome bikes, can't even imagine the cost. As an aggressive rider [read: hack] myself I'd be very scared about breaking them but riding something that light would be a great experience on a good old fashioned xc ride!
  • + 4
 When Exotic = Erotic
Love it all.
  • + 3
 Beautiful builds! And as rogue28 mentioned, you've got some serious pedal pistons for quads!
  • + 3
 Can't get enough, and you know it's righteous stuff, goes up like prices at Christmas...Motorhead!
  • + 0
 I've said it before and I'll say it again. Why not use cyclocross tyres and save 800g? Hell why not just put a suspension fork on a road bike frame? If you aren't jumping, hitting rock gardens or riding sand they work just fine and out climb everything. I don't understand the need for cross country bikes or commuter bikes. If a hack like me can ride an old Ti carbon fork twenty spoke wheeled litespeed bike off road on slick tyres anyone can.
Love the dremel, knife, sanding and general f*ck warranty attitude though.
  • + 3
 Respect. What passion and attention to detail
  • + 1
 Pretty bad that a full suspension 29er weighs more than my road bike lol. And my Marin weighs 3 times the full suspension too
  • + 1
 *less than my road bike
  • + 1
 Wow, I wouldn't have guessed a tubular wheelset would clock in heavier than a tubeless setup. The DT350 stuff isn't very light i suppose. How many layers of glue did you use?
  • + 1
 @iamameatpopsicle The weight is comparable to using "real" tires like the Rocket Rons listed. Weight for these tires are around 600g, just use one layer (regular gluing process). Then those wheels are 80g heavier too, since they're 32h and a slightly heavier rim. Cool thing is that I've ridden those rims 3-4 years already, and love how Dugast tires ride, very supple and nice.
  • + 2
 Holy shit ! For a moment I thought it was Peter Sagan throwing that sick tabletop Big Grin
  • + 1
 W - e - e - n - i - e - s and proud! Making real my fantasy of gram-counting from the Cambria catalogue in the 1990s. Great stuff.
  • + 3
 All the euros be like "I need me some of those denim shorts!!"
  • + 3
 Hell yeah, 2019 before north America catch on.
  • + 1
 They should just make custom fork lowers made out of carbon, and use less spokes. If they do that, the bike can be below 6 kilos, which is well into uci road bike weight
  • + 2
 Sweet man, not what I'd choose to ride but your dedication is insane. Huge undertaking, and a great result!
  • + 3
 This bike is the solution to dieting before a race.
  • + 1
 I tried to weigh my bike, but the scale wouldn't go that high. I weigh 250lbs, and my bike probably weighs ~30-35lbs, and the scale doesn't go that high.
  • + 2
 Was a little concerned after reading 'needs to look good' and saw orange fork but then saw it got painted...whew
  • + 1
 @jrocksdh Haha agreed... Or well, at least for these builds! The Scale frame set is delivered without a fork, so bought a black one and used those lowers on the Spark. Then stripped the orange ones.
  • + 1
 Just wanna appreciate this works on art . How did put all parts at raw paint stripper or what chemical on it looks now no branded ass kicker looks
  • + 3
 What's next, inflating tires with helium?
  • + 2
 I'd like to know if anyone has actually tried this... would be fun to know how much weight is actually saved! lol
  • + 2
 nah to be honest I think you'd save something like 1 gram every litre of helium compared to air. That's just not worth it
  • + 2
 Formula 1 used to do it, but the volume of their tires is massively larger than the volume of a MTB tire, so it's a bigger difference. Also, they used to run helium through their pneumatic guns because they would spin faster, allowing ever so slightly faster tire changes. As far as I know they don't anymore, I can't remember if it was actually banned or if the teams just agreed to stop using it.
  • + 1
 The helium molecules are too small and it leaks through tiny pores in tires, and it ultimately "saves" single digit grams.
  • + 3
 @bicyclerider how much was the cost for each?
  • + 6
 How much did you make last year?
  • + 3
 yeah, how many cavity fillings are these bikes?
  • + 9
 "• No, they are not dentist bikes. In fact, they are so expensive that most dentists would complain in the comment section."
  • + 1
 What's with all the "dentist" comments in the last few months?
  • + 6
 Dentist's comments have been going on for years. Where you been??
  • + 1
 @Lornholio: I may have hopped on the bandwagon a little too late. My bad.
  • + 1
 Awesome passion and result, that's how custom should look like!
Would you be so kind to share installing as well as build thread;

Best regards,
Nick
  • + 2
 And everyone who’s ever tried to chase after Nino Schurter just yelled out varying degrees of profanity.
  • + 2
 I love how far out of the box you thought on this one. Impeccable work! I love custom, one-off stuff.
  • + 3
 man the raw carbon and raw magnesium looks sick
  • + 2
 Wouldnt it be more advantageous to train on a heavy bike? I mean obviously this guy doesn't lack muscle but I am curious.
  • + 4
 I used to work with a roadie who would cut the bead off a set of tires and line another set with them. He would "train" on the double tires and then race on a regular set. He always said, 1 you'll never flat and 2 your bike feels like a rocket ship when you go back to a single tire.
  • + 1
 @Satanslittlehelper: A very similar thing that happens is using old tubular tyres inside training clinchers when out of inner tubes. Racing roadies can be weird
  • + 2
 I Love these bikes. I thought my rigid 20er SS was light at 13lbs but these are Crazy.
  • + 3
 The beard, t-shirt and jean shorts have got to add dozens of grams...
  • + 1
 I had a bike this light one time...of course it had 12 inch wheels and no pedals. That's crazy, it is cool see just what is possible.
  • + 1
 I am a big beard fan, Sagan et al - but that is some prime facial grammage waiting to be removed :-P

Since you already shaved your legs...
  • + 2
 Kudos for going for it. How much weight did scraping the paint off save?
  • + 2
 @cwatt Don't have the exact numbers in front of me but I think it was 94g for the Scale and 90g for the Spark. Was a bit surprised, since the SL's is supposed to have an extra light paint job. But in a way this just makes the actual frame weight a lot more impressive.
  • + 1
 Maybe those muscles are the reason you severed your front brake hose in the last pic!
  • + 1
 Helt galet! Intense attention to detail; very impressing! At what park are you riding in the pic?
  • + 1
 @Alexdeg Takk! It's Gesundaberget Bike Park, located outside Mora.
  • + 2
 Absolutely awesome!! Great job!!.. this is just pornography!
  • + 1
 Я не понимаю этих сидений, что это за самотык на палочке?
  • + 1
 It's amazing to see what can be done to save weight. If you don't mind me asking how much money did the bikes cost?
  • + 1
 So 36t is considered a big chainring these days, has everyone forgotten about how 46t used to be big?
  • + 1
 did you build the wheelsets, and how did you find building with those sapim super spokes? Are they staying true?
  • + 1
 Pretty interesting, but I bet you could "shave" a few grams if you got rid of that face foliage.
  • + 1
 What is that on your down tube in the bleeding pic?Weight to get up to a minimum?
  • + 1
 @Formaldehyde It's just a kit with a spare tube etc. No back pocket on that tee and prefer to keep the weight low rather than having a saddle bag!
  • + 1
 Check www.rdritalia.it/en/mountain-bikes-eng they are making very light bicycles.
  • + 1
 you lost me at i dont like orange.... why waste a special edition and strip it?
  • + 2
 Gotta ask, what do you Squat with quads like that!?
  • + 2
 The daisey dukes.....Hory Shet!! Haha!!!
  • + 1
 also why not go a size bigger so you dont have that ridiculously high seatpost...
  • + 0
 It would be pretty cool to get some (realistic) weight off my Nomad. A couple pounds off would make a big difference. At 29 lbs it is not "heavy" but is by no means light.
  • + 2
 I am happily married to a beautiful WOMAN but! serious leg envy here
  • + 1
 @tomo12377 Laughed out loud at that one haha!
  • + 2
 Those Daisy Dukes a hottttt
  • + 2
 could have gone single speed and shaved a couple more pounds.
  • + 2
 What about fixed gear, no brakes
  • + 2
 The disclaimers are fun to read ;-)
  • + 2
 Make sure you shave your hair and take a dump before you ride!
  • + 4
 I was going to make a similar comment, but it's pretty clear from that last photo that all excess body hair has been shaved for extra weight savings... except the goatee of course Wink
  • + 1
 I made a comment like this to him long time ago on a Swedish forum called Pushbike when he built a 13;5kg Session. R.I.P. then I saw how ripped he is and decided to crawl back under my rock
  • + 1
 @WAKIdesigns: don't ! take var and you will be fine!
  • + 2
 Get a size Small and 26" wheels, 10 lb range!
  • + 1
 Loved the article, super interesting and beautiful bikes. Well done, you should be proud!
  • + 2
 @maxlombardy Thanks, glad you liked it!
  • + 2
 Those shorts should be the new team kit for 9er riders
  • + 2
 The lighter the bike the lighter the wallet.
  • + 2
 F’n awesome. Cool project, very well executed
  • + 1
 reminds me of what building a top spec bike was like in the early 90s
  • + 0
 And I thought my 25lb '17 Bronson was impressive (at least to me), but these builds are on a completely different level!
  • + 1
 Amazing builds, followed it on instagram
  • + 1
 Why dont you try with a Lauf fork. 890grs and 60mm of travel.
  • + 2
 Cuz it would suck?
  • + 1
 @dogui Really don't want to ride without a lockout and real damping.
  • + 1
 WOAW !!!!! 6kg ?????????? LIGHTER THAN A ROAD BIKE ?????
  • + 2
 I"m still in chock...
  • + 2
 Dude is my new Hero Smile
  • + 1
 coolest thing I've seen on PB in forever. Mad props for those pistons.
  • + 1
 "But, I don't really like orange"

Burn the heretic!
  • + 1
 I saw your front brake hose is busted - how did that happen?
  • + 2
 @Hard-Tail-Fan Was a marathon race and with 60km remaining I got passed right before a corner and slightly cut off so I hit his rear wheel with my front and went down in almost 30km/h. So must have gotten it twisted somehow in that crash, so it got ripped off. Finished the race, but wasn't a good result exactly haha...
  • + 2
 @bicyclerider: Glad you are ok - you are HARDCORE man!!
  • + 2
 Sooo cool!
  • + 1
 Those things are rad! You didn't sand down the rocker link?
  • + 1
 @SpruceRipper Thanks! Was about to, but since the Scale was gonna be so clean I wanted to add some color to this one. Painted them to see how I liked it, and I think it added a lot to the looks so decided to keep it even if it adds a couple of grams.
  • + 1
 Now I can finally win a race!
  • + 1
 Those Powerbar Stickers in the last picture must weight so much...
  • + 1
 He should go carbon fork and see how light it gets.
  • + 1
 Brilliant. More articles like this please!
  • + 1
 Jack Tripper wants his shorts back bro!
  • + 1
 I meant my 29erDuh
  • + 1
 Damn.
  • + 0
 I suspect you may like sanding more than riding
  • + 1
 Cable porn
  • + 1
 Holy shit.
  • + 1
 splooooooosh.
  • + 0
 My dick hurts looking at that saddle
  • - 1
 I would worry about delaminating the carbon if you can't see how it is laid up under the paint.
  • + 0
 That seat looks painful...
  • + 1
 Very cool!
  • + 1
 Orgasmatron
  • + 0
 User generated, No mentions of e-bikes? Well done Pinkbike, well done.
  • - 1
 I don't think I weighed 187 pounds since grade 4...
  • + 0
 Man those tights...
  • - 2
 If weight was a concern, Would it not be lighter to build a 27.5 steed? LOL.........you see how i derailed this discussion.
  • - 2
 My ass hurts just looking at that seat
  • - 3
 Yes, I would have to be an idiot to buy and under built bike. No, I don't wanna buy your under built bike.
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