The Gamux Sego "Semi-Automatic" Gearbox DH Bike Is Available To Preorder

Jan 17, 2024 at 2:19
by Seb Stott  
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We've been following the development of Gamux's downhill bike for the last three seasons. The small Swiss team are doing several interesting things: combining a high-pivot, belt-driven gearbox drivetrain with a CNC-machined frame made with I-beams instead of tubes. Now, this radical bike is for sale. It can be pre-ordered now and should be available from March 2024.

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While early versions had a four-bar suspension system, more recently Gamux settled on a high single pivot layout with a futuristic machined swingarm. The six-speed Pinion gearbox is still present, and a version with "semi-automatic" shifting is available thanks to Pinion's C 1.6 Smart Shift system. This uses a small battery to shift gears electronically in the gearbox. The shifting can either be controlled via an electronic shifter under the bar, or automatically, using a speed sensor mounted on the rear rotor to sense the speed and shift automatically so you're always in the right gear.

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The Sego delivers 198 mm of rear suspension travel via a linkage-driven single pivot layout, said to be compatible with coil or air shocks. It can accept 29" or 27.5" rear wheels with different swingarms for each (there's no flip chip to accommodate either with a single frame). The 27.5" swingarm also reduces the rear-centre length from 460 mm to 445 mm. It's available in three sizes, and the ZS56-ZS56 headset makes it possible to fine-tune the fit with a reach-adjust headset. The frame weight is quoted as "low and central".

A frame kit including frame hardware, Pinion gearbox and Gates Carbon Drive is available for CHF. 6,250, or CHF. 6,700 with Pinion Smart Shift. The Manitou team build shown above with the Dorado Pro fork and Mara Pro shock costs CHF. 10,000 (CHF. 10,450 with Smart Shift). An Öhlins option with DH38.2 fork and TTX22 shock costs CHF. 11,000 - 11,450. The frame carries a 2-year warranty against damage "when used as intended".

For more information, head to gamuxbikes.com



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Author Info:
seb-stott avatar

Member since Dec 29, 2014
297 articles

143 Comments
  • 152 14
 Don’t care how it rides, it’s sexy af.
  • 146 25
 It looks like a prosthetic leg....
  • 6 4
 @scott-townes: :'D :'D :'D
  • 63 4
 @scott-townes: a sexy af prosthetic leg!
  • 6 0
 @scott-townes: A one legged hitch hikers dream.
  • 18 0
 oscar pisstorius has (been released from prison & ) entered the chat
  • 4 0
 Agreed, what a work of art!
  • 6 1
 Agreed.
It’s beautiful.
I get suspension designs dictate frame design, but I will never understand why full on DH bikes don’t all have extremely low stand over like this one.
  • 3 0
 Agree. Have absolutely no use for that thing...but I want one!
  • 1 2
 Looks like a BMW. Which is a good thing indeed!
  • 1 0
 @scott-townes: Comment of the year so far mate
  • 81 5
 hell yes, congrats Gamux. Its been a pleasure supplying you guys with all the cnc-parts for the different prototypes as well as the batch productions. => www.desion.ch = Keep up the great work.
  • 36 0
 You guys make it possible! Amazing Quality and Service!
  • 24 1
 awwwwwwww
  • 44 3
 The revolution has started
  • 35 23
 I like the idea of a gearbox and I think the bike looks great. However, whenever I see the words 'battery', 'eletronic', 'automatic' or anything of this sort, I just dismiss it.
  • 14 0
 @aug7hallak: you can get it without any of those things.
  • 50 10
 @aug7hallak: sent from iPhone
  • 1 3
 Has started yes, but where is it going? ;-)
  • 20 11
 @PHX77: I meant on my bike, obviously. The same way I'm not interested on a gearbox on my computer.
  • 6 19
flag Duderz7 (Jan 17, 2024 at 5:35) (Below Threshold)
 @aug7hallak: Amish?
  • 1 4
 @aug7hallak: ok grandpa, now lets get your pills
  • 33 1
 Can we get Danny Hart on this for 2024 please thank you
  • 2 0
 He's on Nukeproof..
  • 4 0
 @M0T0: Low res silhouette jpeg or it's not happening
  • 29 1
 It's black, scary looking and semi automatic. Unfortunately it won't be legal in Canada.
  • 1 0
 hahaha good one
  • 22 0
 "The Manitou team build shown above with the Dorrado Pro fork and Marra Pro shock..."
Is that the limited pirate edition? Yarr!
  • 15 0
 when in doubt, double the RRRRS
  • 16 0
 Team rumors; Berrnarrd Kerrrr and Amaurry Pierrrron on a Dorrado in 2024
  • 7 0
 The Pirate Convention would agree, that the Manitou DoRRRRado, is the best fork...

youtu.be/K7aM_HWMdj0?si=jb6ivy9-TawACTEQ
  • 21 4
 I know its the norm but for that price I'd hope for more than a 2 year warranty.
  • 21 5
 That is a fantastic piece of functional design. It's bold, it's industrial, and gorgeous in the same way old bridges are. ...damn, I really must be an engineer.
  • 10 0
 You told us you are, so you must be! -an engineer
  • 3 3
 Straight Edge Vegan Crossfit Fixie rider here...
  • 11 0
 Looks like a... Errr... Nope, got nothing.
  • 13 3
 Brooklyn machine works??
  • 7 4
 Looks less complicated than a Trek Slash and no chain to fall off every run.
  • 3 2
 looks like a Balfa BB7 to me, or an old Turner DHR.
  • 2 0
 The main lines make me think about a BTR Fabrication, but the details... hum.
  • 5 1
 Looks like an evolutionary stage of the Lahar M8 (took 20 years)
Single pivot kinematics with rocker: check
High pivot: check
Central gearbox: check
one piece (?) swingarm
Steep seat angle and very low top tube: check

love it!
  • 8 3
 My prediction is that, as usual, the comments will run the gamux of opinions, from fanboy superlatives to the negativity of the naysayers.
  • 5 2
 -look cool AF -My experience has been that single member swingarms experience a lot of rear wheel twisting under side load. Extremely small sample group of one, so YMMV. -slap a battery and the pinion motor on so we can self shuttle please
  • 2 0
 Agreed on the single arm flex issues historically. Since pinkbike doesn’t like to quantify things like this with measurements, hopefully someone here will link to a German article in which flex is measured for comparison.
  • 5 2
 Love the bike and the concept but I'd like to see some more detailed information on the bike for double the price of other brands. For example what's goign on with the carbon tubes?
  • 5 0
 Have a look at the FAQ, it is something between really direct answer and ridiculous Big Grin
  • 16 0
 We use the carbon tubes to modulate frame compliance. We have invested countless hours in the past three years to figure out what works best for us. The Sego is very much focused arround having as much mechanical grip as possible available to the rider without is loosing out in the precision department.
  • 3 0
 @GAMUXBIKES: Where in the frame are these bonded carbon tubes? Those dimly lit pictures of a black frame aren't making it easy to see details, I'd love to see some more detailed pics.
  • 5 0
 @robw515: they are in the downtube and toptube. A total of 4 tubes are used and bonded to the 7075-T6 "spine of the frame. You can't realy see it in the picture here since its black on black. You can find better pictures on our webpage:
www.gamuxbikes.com/sego2024
  • 1 0
 @GAMUXBIKES: what do you mean with "mechanical grip"?
  • 10 0
 @vhdh666: "mechanical grip" is acctualy coming from some car-racing friends of ours and referes to the ability of the frame (or chassis) to cope with the vibrations and loads that the tires and suspension would transfer into the chassis.
My english is by far not good enough to explain all the sientific details, but imagine the frame helping you to keep gripping in a rough offcamber section without bouncing of roots rocks and bumps. Maybee the best analogy is "frame-compliance" - correct me if im wrong Smile
  • 1 0
 @GAMUXBIKES: Would be great some better and more detailed photos. The bike looks awesome.
  • 1 0
 @GAMUXBIKES: yes I suppose "compliance" is the correct term

Es ist ein geiler Rahmen, sehr innovativ und wahrscheinlich seid ihr eure Zeit weit voraus.
  • 7 3
 Best looking bike in the Worldcup. Plus probably the most silent and most glued to the ground? (together with the proto demo)
  • 6 0
 Gearbox sans grip shift. LFG.
  • 4 0
 My next bike will 100% have this.
  • 4 2
 Has anyone done the number? The frame, drive, and gearbox is 7k USD.

I bought a Kavenz VHS Pinion frame for 3k, adding a gearbox with the same drive would add at most 2k.

Still a nice bike if you need a DH ride.

I think Zerode has a new DH Pinion sled in the works.
  • 3 0
 How are you liking the Kavenz? I have a VHP16 (no gearbox) and love it but wondering real world opinions of the gearbox version.
  • 1 0
 @Yuley95: same! I wanted to buy a vhp g but nobody talk about it. No reviews, no opinions
  • 4 0
 I love the look. I like that they’re trying all the gearbox stuff, but for me personally, I’d love a “park rat” edition that’s setup single speed.
  • 7 2
 Smart Shift - (not so) Smart financial choices
  • 5 1
 I'm not so sure about that. No chain, cassette, derailleur to replace from wear or damage. It adds up, especially if you pay someone to do it.
  • 6 1
 I want one! And I don't want one ($). I'm conflicted.
  • 4 0
 I mean I'm never going to be able to afford one, but if I could I would. Great bit of kit.
  • 2 0
 I have to suspect UCI won't allow anything but manual shifting. I wonder if there's even a rule regarding 'auto' shifting in DH racing?
  • 4 0
 Only if it wins something.
  • 2 0
 It is a very cool bike, But $13,000.00 US dollars makes it crazy expensive when you consider the Frameworks DH Frame with a similar bike setup would be about $8,500.
  • 1 0
 Or a Demo with Ohlins suspension for $7000. Smile
  • 5 2
 When’s the enduro version coming or can I just run this with a dropper?
  • 2 0
 FAQ on their website says no
  • 3 0
 Classic
  • 20 0
 We are working on a 170mm version with a longer seat tube that will accept a 200mm dropper.

Watch this space Wink
  • 5 1
 @gregberry: my sarcasm didn’t come across the internet very well.
  • 2 0
 @bikerboywill: the frames are only available in Europe. Question is, if they produce a Enduro version, would you (from UK) be able to buy it
  • 2 0
 @GAMUXBIKES: love that DH frame and I'm looking forward to the Enduro version
  • 1 0
 @vhdh666: We do ship to the UK Smile
  • 2 1
 @GAMUXBIKES: I was just joking. When my friends from UK go to Italy or France for riding they say "we go to Europe", LOL
  • 2 0
 looking at this an other similar desighns an thinking how long untill body panels become the norm.......
  • 3 0
 Great looking bike. The belt tensioner is tucked away nicely too.
  • 1 0
 All those gears and pulleys and girders give me steampunk vibes. Add some copper accents and it will be a hit with the goggles on top hats crowd.
  • 2 0
 I’d never thought I’d be exited about a bike with a gearbox.. but that’s one of my favorite DH bikes
  • 4 2
 Is "mechanical grip" an thing in 2024?
  • 1 0
 I've asked myself that too
  • 1 0
 Yes, I think so. I noticed my steel bike without carbon rims feels more compliant now that you mention it.
  • 3 0
 $18000 cad wow
  • 3 0
 To be fair it does include VAT. I added one to my cart and it removed 1000CHF of the price when I set it to Canada. Now thats a bargain.
  • 2 0
 @Ryan2949: It's still wow expensive, esp for a bike that few will buy ... as an enduro bike, it might make more sense.
  • 2 0
 Looks awesome - but £10k, I'm out.......
  • 2 0
 The 10 people who buy one will be very satisfied.
  • 2 0
 11,000 Canadian for a frame
  • 2 0
 Looks like something Paul Aston would ride (for good reason)
  • 1 0
 Gearbox is cool and all, but are you really shifting that much on a DH bike?
  • 1 0
 Whats the story with all these bikes running Dorados??,im pretty sure my old 26 ones where given away!!
  • 1 0
 Pinion is so cool, imagine one day we all give up chains and the exposed and vulnerable drivestrains....
  • 1 0
 Ahh perfectly timed with my impending financial ruin
  • 2 1
 The Trialsbike of downhill haha
  • 1 0
 Looks like a futuristic BMW Racelink. Love it!
  • 1 2
 That reach, I'd love one but I struggle with anything over 400mm, I thought small DH bikes where getting back to about 425mm reach this year, well some are n some aren't..
  • 3 0
 400mm? Wow, you're really small!!
  • 1 0
 @sanchofula: not that small 5'7" but have short arms n legs that have me too bent over.. I like a 50mm stem for a 29 front to get weight over it as well, tried shorter but not as good grip. Bikes have got longer for taller people which was needed but for us short folk this small size is now longer than old XL frames. I'm quite comfortable on an old medium frame just under 400mm reach.
  • 2 1
 @bat-fastard: hey now, my first XXL 29er was 430mm reach and rode well with a 120mm stem.

For real, shorter riders tend to do well with taller bars
  • 2 0
 @GTscoob: Have a good high stack height on both my bikes, have a sweet spot at minute, had 50mm rise in past on 26 DH but when mini mulleted it dropped down to 25 to keep overall stack same. On my full mullet have 15mm rise as upped front travel to 180mm. Bars are also at 750mm wide but grips are cut down so holding at ends. Had wider but with short arms couldn't lift bike same on jumps, was better in corners but no good if not comfy in the air. Totally understand for tall riders, bikes where too small for them, but I know quite a few smaller ones like me struggling with reach and one who had to cut his seat tube down to get dropper post in. I've only a 75mm dropper on my craftworks but its enough and its a limit of frame that I knew before I got it.
  • 1 0
 Needs to have a 435 S0 size.
  • 1 0
 @ngextreme: supernought is 420 thats where i'm looking.
  • 2 0
 Looks like a girder.
  • 2 1
 ...that don't look like a Session...
  • 2 1
 No water bottle would not ride
  • 2 1
 Holy moly what a beauty. Any posters available?
  • 1 0
 Kind of looks like its made of Lego Technics
  • 1 0
 It's a shame they didn't incorporate a flip chip in the swingarm.
  • 2 0
 No performance compromises this way. The market for people wanting to switch wheel sizes back and forth is too small.
  • 1 0
 And this is how you can take scaffolding and make a bike!
  • 1 0
 i like how its a step through frame perfect for the aging dentist
  • 1 0
 I was thinking of cans, knacks, buzzers, tables, etc. But yeah I’d have to take out a second mortgage.
  • 1 0
 Dear 'Murricans, It's not what you think.
  • 1 0
 ** leaves the room to find something to sell
  • 1 0
 It looks like it's from the 90s
  • 2 0
 Looks like a Balfa
  • 1 0
 What the f*ck is a CHF..?
  • 1 0
 Weight?? Gearbox drag?
  • 12 1
 Complete bikes w/o pedals, depending on frame- and wheelsize start at 18.2 kg.

After the initial breake-in time of the gearbox, the added drag is virtually zero. Since you have a consistant "belt-line" throughout all the gears, it's acctually better than a 1x12 system in the upper or lower gears.

Pinion and Gates do quite good work in R&D to adress the whole drag-issue. We can just speak from our expereince on the DH bike - we only find benefits.
  • 1 4
 @GAMUXBIKES: I ride a belt drive pinion bike and the belt for sure adds friction, as does the gearbox. In terms of durability and reliability, the gearbox makes sense, but the belt, probably not as much.

Do you sell the bike with a chain drive?
  • 3 0
 @sanchofula: No, we do only sell it as a belt-drive system, since that is what we found works best for us.
  • 1 1
 i like website video how it shows no peddling
  • 1 0
 Wow! Very cool bike.
  • 4 5
 Is there anybody that really use gears on a dh bike?
  • 17 1
 Most people use at least one.
  • 2 4
 That was kind of my point, but I got downvoted.
If you're racing, that's cool.
If you're smashing park laps at Whistler/Morzine then it's an expensive and unnecessary luxury.

I highly suspect most DH sales fall into the latter category.
Cool that this bike exists, but it feels like a niche within a niche.
  • 1 0
 The Tenth Sub Level of Suicide no-handers
  • 3 0
 Been running single speed now in likes of Morzine for at least 7 years now, 32t front 12t rear on a 27.5, now running sb one tensioner as had a £20 ebay one first.
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