First Look: The Compotech Cduro Integrates Its Carbon Tubes and Joints - Pond Beaver 2021

Apr 9, 2021
by James Smurthwaite  

Normally, when we bring you new bikes from new brands they come from enthusiasts and shed builders with a lot of passion but not a great history of designing and building complex machines. That's definitely not the case with the Cduro bike from Compotech.

The Czech brand was founded in 1994 and is a specialist in carbon fiber tube and beam manufacturing. The second-ever product it produced was a carbon lower leg for a telescopic MTB fork and it has been building everything from kayaks, to sailboats to seat tubes since.

The Cduro started in 2017 as a passion project and was inspired by both the enduro trails of the local Sumava mountains and the fact that Compotech's R&D Director, Ondrej Uher, couldn't find a carbon-framed long travel, progressive geometry bike to tame them at the time. The mission for Compotech was to build the kind of bike with the geometry to rival a Pole or a Nicolai while using its in-house carbon technology.
Compotech Cduro Details

Frame material: carbon fiber
Travel: 170mm
Wheelsize: 29"
Intended Use: Enduro
Price: TBC
Available: 2022
More information: compotech.com

Compotech's facility is located in Susice in the Czech Republic, close to the German and Austrian border.

There are a few things Compotech has done differently with this bike. Firstly, its carbon yarn is picked from over 50 types of fibers available on the market, which it says makes it possible to "optimize tubes with unrivalled freedom." Secondly, the layup is done via automation using Robot-Assisted Fiber Laying (RAFL) and the tubes are created with Integrated Loop Technology (ILT), where the joint and tube are made from one piece of carbon fiber.

Compotech explains, "In principle, you can take one fiber tow, which is continuously impregnated, and 'wind' it, using a robot arm, around the mandrel-tool with the unique and precise end adaptors, forming a loop diameter, thus connection for other tubes in the frame." In short, the way this frame differs from other additive manufactured frames, such as the Moorhuhn or the Atherton Bikes, is that instead of having separate lugs and tubes joined together, they are all one piece on the Cduro.


Compotech lists a number of advantages to this system. Firstly it makes assembly easier as it's effectively just a case of putting a jigsaw together. They also claim it is, "exceptionally stiff, strong and reliable as there is no fiber cut, joint or hand lamination." Finally, automating the process means it's cheaper as there's less labour and it removes any quality issues caused by human error.



So, why has nobody tried this before? Well, Compotech believes the bike industry to be very conservative, relying on technology developed in the 1970s and hand lamination. They think that the bike industry is missing its Elon Musk to move it into its next phase of carbon production.

Compotech first began exploring ILT in 1995 in co-operation with CTU Prague, in return they have been able to use the university's FEM analysis and strain measurement equipment to validate its bike.

As for the bike itself, it's a single pivot design to keep it simple and reliable. Thanks to the long reach of the bike, Compotech had plenty of space to move the main pivot around and have ended up satisfied with its characteristics, the suspension graphs are below:



Inspired by bikes from the likes of Pole and Nicolai, it's no surprise that this bike has some serious length to it with a reach of 500mm in size medium. The following chart is based on a 29er with 150mm but it can also be run as a mullet with 160mm travel with a longer stroke shock.


Compotech is hoping to have the bike on sale by early next year and expect the price to be competitive thanks to the automated nature of its construction. It is also apparently working on other mountain bike projects but is keeping its cards close to its chest for the time being. For more information, click here.


Pond Beaver 2021





102 Comments

  • 61 1
 This makes so much sense! An unbroken chain of carbon fiber is immensly more strong than a broken, then glued piece, which is basically all other carbon fiber manufacture process, making me not doubt for a second the strength of those thin looking joints. Adding that these get bonded to the tubes underneath should make for a brilliantly strong frame. And it doesn't even look like a Session!
  • 11 1
 At second look I think you’re right! The only broken carbon head tubes I’ve seen broke at the seams.
  • 21 2
 ...except bladder-molded carbon frames do have continuous fibers running from both top and down tubes around the head tube. It doesn't loop around continuously along the top tube multiple times, but you also don't need the same wall thickness mid top-tube as you do where it meets the head tube. Interesting technology, but it solves an issue that doesn't exist.
  • 4 2
 @n00bmtbr: you can very the wall thickness with a filament wound system.
  • 7 2
 @shirk-007: alright, but parting lines are still not an issue for the vast majority of carbon frame construction on the market now. there are rare semi-custom lugged construction approaches, but that isn't the norm. Again, cool technology, but I don't think the selling feature actually solves an existing problem.
  • 6 2
 @n00bmtbr: does the bike industry only innovate to solve existing problems? Was not carrying snacks in the frame really a problem?
  • 14 3
 @n00bmtbr: carbon fibre itself didn't solve a problem, as we already had frame materials that have proven reliable. As an industry veteran, you would be blown away with how many carbon frames break, especially when compared to aluminum or steel. Carbon definitely needs improvement, so let's not get down on someone who is trying to solve an actual problem, which is frame strength.
  • 5 4
 @n00bmtbr: where do you get you blackberry batteries?
  • 15 6
 @rcybak: I must have missed some sarcasm here, and cool flex on your veteran status. I've been away for over a decade from composites engineering in the bike industry, so must be out of touch. If I've missed that this is actually an article about kids, and their dreams about the future I'm sorry... my B. happy to move along with my blackberry, apparently.

If, however, this is an article about a unique approach to a a non-existent problem, my opinion still stands. In the modern capitalist world, there are low-wage workers in countries far from where you live that are quite proficient at laying up carbon frames with continuous fiber across tube junction points. It's shocking how little they are paid, but they are adept at consistently following layup directions per spec from western world bike engineers. As shipping costs increase, there is absolute outrage from pinkbike readers. Can you imagine if bikes were actually constructed by workers with a living wage? Or high-priced engineers programming robots to do the same? Who is going to pay a premium for this idea?

I'm not against progress. That's literally my point. This is a parallel, unnecessary path that solves no common problem that already exists. Cool tech. love robots. I will not see this on the trail, and my head tube will never shear off due to bonded lugs instead of continuous fibers.
  • 1 0
 @n00bmtbr: Well, I would argue that not solving a non-existing problem, as you put it, would leave us without progres. Whough small as it may seem, it might be a slight improvement on how we us a well develloped material/process. This is what's called progress, and is why a bike from 2021 is far better than a bike from 2011. It might not seem as an emediate problem, but if one can make a product lighter, for the same price or cheaper and with the same strength as earlier products, with a new process of using an existing material, this can only be seen as progress.

To me it also seems like there should be less waste material using this process, seeing that the carbon fibres are used from a thread like thing, rather than pre-woven sheets cut to shape.

To summarize:
Not unnecessary path, because you get just a strong product as no, but gain lighter and cheaper.
  • 3 2
 I’d say the key problems solved are in the article mainly, quality consistency and reduced human labour...

However to refer to having no Elon Musk in the industry... kinda short sells Elon - As his new product is always a push for better at all levels, I feel like these guys are still in need of the final 20% effort to polish the finished product and make it look like the best quality frame aesthetically
@n00bmtbr:
  • 3 0
 @n00bmtbr: As a long-term solution that benefits humanity it seems like the filament winding technique is far and above hand-lay/bladder tech/and general fabric-based approaches.

-Less waste: Benefits of pre-preg straight from the roll with no cutting and throwing away useless pieces
-Fewer error points: Once you have the program for your robot set there's way less manufacturing variability
-Humanitarian: Over the long-term you don't have humans doing rote, repetitive jobs that suck more
-Molds are hard to make (whereas you could do this process easily without CNC)
-Potentially cheaper from a materials standpoint
-Repeatable, plug-and-play nature is (more) marketable and implementable for others

On the other side,
-Robots are expensive, and tooling is still required
-Thus initial payback period is likely longer
-Potentially LESS FLEXIBLE with design (big one)
-Worse if you hate the environment and love providing meaningless jobs
  • 31 0
 That leverage rate curve is hilarious. It's linear(ish) but the y-axis is crazy misleading. Not bad, just an observation.

Looks like a badass bike.
  • 7 0
 Yeah I actually laughed when I clicked at the picture to see the numbers.
  • 3 0
 also i would never install a coil shock in a linear bike. 0 progression
  • 1 0
 Can we just agree on a scale for these graphs and stick to it on all pb reviews at least?
  • 38 9
 "The bike industry is missing is Elon Musk" No thanks.
  • 13 6
 Elon Musk in bike industry?
No, thanks!
  • 17 9
 That's crazy, have you ever tried DMT?
  • 6 1
 Agree 100%. Bikes would be auto-crashing all over the mountain!!
  • 5 5
 I put a deposit on his internet, which I am really excited about. His stuff seems to work out well.
  • 2 1
 Wait until Elon Musk stinks up the joint with a wireless hydro brake!
  • 1 1
 @CSharp: no problem all you need is a piezo valve at the caliper and lever with a standard communication protocol and small reservoir at the caliper and you're good. Don't forget to charger your battery!
  • 4 0
 I mean surely there have been people in the bike industry that smoke a similar amount of weed as Musk.
  • 4 4
 @Kainerm: I am pretty sure many people in the bike industry smoke way more weed annually/ maybe even monthly than Musk has ever done in his life. I’d be surprised if he had time for getting stoned. But I bet he smoked more than folks at Pole or Rapha Big Grin
  • 45 31
 Metal tubes and welds are the only thing everyone needs!
  • 8 9
 500% agree
  • 24 47
flag NorCalNomad (Apr 9, 2021 at 12:17) (Below Threshold)
 what a dumb comment
  • 69 5
 4130% agree
  • 52 0
 Disagree, why have metal when you can have carbon that looks like a homemade steel frame
  • 2 1
 @sewer-rat: LOL Very true
  • 14 1
 Please tell me more about what I "need" for this mountainous velocipede piloting recreational activity!
  • 8 4
 @dirtyburger: Well since you asked my good fellow. It's quite obvious that you need the most sincerest, loving, heart warming advice as you are incapable of making an acceptable decision. I am glad to guide you in the correct direction. I will accept no thanks for this advice as I like to help a fellow Mountain Biker in clear distress and confusion. Fear not, I am here to help..... BUY METAL!! And you will be OK
So glad to be of service what what!
  • 8 0
 From now on everyone can only use what this guy approves of. You have to wear the same sized clothes and everything.
  • 2 1
 @sewer-rat: something called frame compliance
  • 1 2
 @alexsin: Correct
  • 2 0
 @Gibbsatron: 511% agree...
  • 4 0
 I'm an Old Bastard that still, and forever will, melt metal, TIGing the frames I build.

But, I've Absolutely No Problem with other materials, used appropriately, and, made well!

These, look good. And, boys and girls, check on this company and you'll see they do a huge amount more than just their Bicycle frames.

It's a clever use of 'tubes' (without them being, strictly, Tubes). Quite a joint solution, the 'banding' around other tubes.

But, over and above that, It's Great to see a Single Pivot bike, Not going straight into Falling Rate. It may towards the end of the travel, but, without a full on side view, I can't be sure if it does, or doesn't.

It looks like they could also have the potential to have a small idler wheel / roller on the Swingarm pivot, if they wanted to try it / offer another aspect to the design.
  • 1 0
 @hamncheez: My bike's anti-squat drops off as you get into the travel, but does run above 100% Anti-Squat sitting at sag. I personally have not experienced anything noticeable in regards to pedal kick back, and that's why I asked the question. Also, the graph is deceiving, at first glance it looked like anti-squat was rising at an incredible rate, but really it goes from 99-108, which is conservative for sure.
  • 5 1
 large ... 530mm of reach next year XL 600mm
  • 7 9
 That’s the result of a compromise when you go for super steep seat angles. If you don’t extend your reach your ETT gets too short and you end up cramped on flatter bits and perhaps over extended on descents. Add a taller person to the picture and you need to add good 6-8cm of reach to what used to be the norm in 2016 when cool seat angle was 75-76
  • 2 2
 @justwaki: 78 is a new 76. Justike aluminium is a new carbon. So, of you want to make a kewl carbon bike, you have to make it look like it's made of steel
  • 6 8
 @pakleni: hahahha. The thing is, the only reason I have sympathy for this is that I am Polish - that means I am highly prejudiced. I simply have an extremely hard time imagining a Czech brand being run by folks in flanel who drink craft beer or someone like a undernourished, underpaid Brit who... sells custom frames to folks who wear flanel and drink craft beer... so they are not really someone who will suck up to type of folks looking for a frame to carry their Cane Creek Ewing cranks and wheelset on I9 hubs. They are Czech, they drink lager, smoke good weed (for Slavic standards) and despise Polish prejudiced a-holes like me Big Grin
  • 1 1
 @justwaki: You forgot Czech girls
  • 1 1
 @justwaki: It's so difficult for people to get their heads around this.
  • 4 0
 Looks like the strongest carbon on the bike is the Chromag BZA bars.
  • 2 2
 I actually think the increase in antisquat as you go through the travel is better than what DW/VPP/Switch-inifity does (which is the opposite)

I'm sure compotech placed the pivot really far forward of the BB to allow for a falling leverage rate (more progression), but the increase in antisquat deeper in the travel is a nice side effect.
  • 6 0
 In those instances you are out of the saddle hammering the pedals, for sure. But as you get deep into the travel wont that amount of pedal kick back be bad?
  • 6 1
 Not sure if serious but what you just said makes exactly zero sense.
  • 2 2
 Nothing is better and DW or VPP. Iron horse Sunday and Quad link marin wolf ridge are still, the best feeling rear end I've hung out of....
  • 1 4
 @Hardnacks: Tell me, have you ever actually felt pedal kickback? The only time I've ever felt it is on a DH bike with a high pivot but no idler chain, and that was only when the rear wheel was completely locked up and I was going down something very steep, almost like a staircase. I could feel it, but it didn't cause me to crash nor really effect how the bike rides.

With "only" 150mm of travel its going to be a very, very rare occurrence.

i.pinimg.com/originals/c3/35/cf/c335cf7643a85b619b5954c4cd5d7245.jpg
  • 1 2
 @Mondbiker: explain?
  • 7 0
 @hamncheez: Why on gods green earth you would want more AS in other part of suspension travel than the one where you are actually pedalling?
  • 2 3
 @Mondbiker: Reverse it- why would you want LESS antisquat further in your travel? Why would you want less antisquat at all?

The idea is too much antisquat will cause pedal bob as surely as too little- you just bob up instead of bobbing down. This doesn't really matter deeper into your travel- either you aren't pedaling anyways, or if you do put some power down the high antisquat will pull the bike back towards the sag point. If your antisquat decreases as you approach the sag point, then if its tuned right it will be at that "equilibrium" level of antisquat, and on the next pedal stroke it won't bob up.

High antisquat in traditional designs is closely related to chain growth, as chain tension is the primary cause of antisquat. Excessive chain growth will drag on the suspension performance (as seen with the famous chainless run) and pedal kickback (but only at very, very slow speeds or rear wheel lockout). The most important part of your travel for ultimate grip is roughly around the sag point. Deeper into your travel the primary function of the travel is no longer to maximize grip but to deal with high speed, large impacts, and return the rider to the sag point without bucking them forward from too high rebound speeds. In this design, the increase in antisquat, since its highly correlated with chaingrowth, means the axle path is slightly less forward, deeper in the travel. The wheelbase shrinks slightly less, and the wheel moves over square edge hits slightly better.

All these effects aren't huge. It isn't that big a difference. if you look at the new rear axle path of the new Session, its not much different. A few mm here and there, but its noticeable enough that the riders want to race it now, and not wait for a carbon version.
  • 2 3
 @hamncheez: Compression forces not handled with damping will buck you, rebound really has little to no effect. Rebound is a very limited force, nowhere near enough to throw you over the bars.
  • 3 0
 @emptybe-er: I'm still working on setting up my fork, and rebound is quite the force. I have a hard tail, but i have tried a full squish with rebound wide open, and as a light rider (Maybe 130 lbs total), Rebound will buck me off if not dialed
  • 1 0
 @hamncheez: Reverse it- why would you want LESS antisquat further in your travel? Why would you want less antisquat at all? Because I don´t pedal while deep into travel and thus want my suspension to work as freely as possible. Pretty simple and up untill this point no one needed this explained, but here we are.
  • 1 0
 @noone1223: It isn’t rebound that’s bucking you, that’s a common misconception. Bounce on your seat and see if you can make it over the bars.. it won’t happen till you bottom out hard enough to send your weight the other direction.. or just google it. It makes sense when you really think about physics and what a spring is capable of.
  • 1 0
 @Mondbiker: That deep in your travel, a rearward (or less forward for most 29ers) is more important than suppleness. You need the bike to react to large hits and return to the sag quickly, and to preserve geometry. You aren't worried about small bump compliance in the last 1/3 of your travel.

As I said before, with only 150mm of rear travel is isn't that dramatic of an effect.

Since we've all been on single rings for a while, idler pulleys can solve both these issues and if Forbidden is anything to go by it works on shorter travel bikes that need an efficient drivetrain.
  • 1 0
 @emptybe-er: Sounds like you've never ridden the crap RS Monarchs with Rapid Rise.

Its true, bucking mostly comes from bouncing off the bottom out, but controlled rebound helps. Also, with too fast rebound deep in your travel it can shift your weight forward after g-outs (once again, try a rapid rise rear shock).
  • 1 0
 @hamncheez: I haven’t ridden monarch enough to really have an opinion, just rebuilt them. But I’ve raced and ridden enough to know what springs and rebound damping do. If your weight is shifting forward after a g-out you need to balance front and rear spring/damping and maybe body position. I remember Jordi Cortes (Fox) talking about setting up Kyle Strait’s bike for rampage and talking about how his rebound was set fast because it has no effect on being bucked, and he’s absolutely right.
  • 1 0
 @emptybe-er: "balance front and rear spring/damping " its hard to do when your rear shock has very little high speed rebound damping, and you have to air it up to 310 PSI to keep off the bottom. Those shocks with their Debonair 1st gen negative spring had no ramp up, even with all the bands, and my M/M tune had no reasonable high speed compression damping either. If your spring rate is high and your compression reasonable, then you'll bottom out less harshly and therefore get bucked less.

On Rampage sized hits, yes, then probably rebound can't save you, but for us lesser mortals who can get bucked without really bottoming out hard it matters.
  • 1 0
 @hamncheez: Kyles shocks may have been coil though. And air springs are progressive, so it’s not really apples to apples. Bucked is a strong word though haha!
  • 1 0
 @emptybe-er: Full disclosure I kinda suck at riding. When I was young I hit things like the crabapple jumps but it was with faith, prayer, and the recklessness of youth, not any skill. I need reliable damping from my rear shock to provide chassis stability because I cannot manage it on my own haha
  • 1 0
 @hamncheez: Won’t it be cool when wheel rate and wheel path are finally balanced front and rear? High pivot designs are getting close to matching front wheel path but 1:1 leverage ratio shocks would be such a treat for consistency and reliability.
  • 2 0
 @hamncheez: I generally kinda suck at this point, too. I’m much more about being wreckless vs reckless nowadays.
  • 3 0
 I wish more companies offered their carbon bikes with just some decals and a clearcoat. I love the look of bare carbon
  • 2 0
 My understanding is that making carbon layup strong and making it pretty are not the same.
  • 1 0
 @jpcars10s: yeah that's probably true, I still wouldn't care I just want a bare carbon bike tbh. Just like my want for a bare metal bike
  • 1 0
 I was stumped I’ve seen continuous fibre placement over two tools to create this strap type tow braided affair before as a joint but for the life of me can’t figure out what’s new
  • 2 0
 I'll admit the frame looks a little be square for me. Weird how some bikes are like that
  • 4 5
 This thing looks sexy as hell IMO, but there are some definite concerns. Thin carbon, even when layered correctly, gives me the heebie jeebies especially in places under a lot of weight and torque. So those head tube layers make me nervous. Furthermore it just creates more areas for frame disconnects or de-laminations. Still seems super sick.
  • 5 9
flag d-a-n-c-e (Apr 9, 2021 at 12:10) (Below Threshold)
 Agreed, that carbon looks sketchy as heck
  • 2 4
 @d-a-n-c-e: I'm with you, it might stand up to testing on the rig and it looks rideable too from the one photo, but are they also testing lateral forces and twisting loads? I like the concept but for an xc rig not for a heavy duty enduro. For that application I'd like to see the same process but full coverage at the junctions.
  • 2 0
 Talk about some optimistic chart labeling to make your suspension characteristics appear far different than they are.
  • 2 0
 I want this bike bad. If we're talking Geometron competitor, it could use a slacker HTA. G1 is down to 62.5
  • 2 0
 What's this annoying pond beaver shit? Why are you making me read it in every single title?
  • 3 1
 Looks like another frame I've seen in titanium except carbon
  • 3 0
 @hamncheez: Yep, I think they both look pretty sweet
  • 2 0
 No water bottle cage? Not sure if a small bottle will even fit in there.
  • 1 0
 I lost interest at "exceptionally stiff". No one who knows what they're talking about should ever use a phrase like that.
  • 1 0
 Shouldn’t the title be “ The Compotech Cduro Doesn’t Integrate Its Carbon Tubes and Joints?”
  • 1 0
 Didn’t Toyota spend all the money to make the lfa’s a pillars like this?
  • 1 0
 Is this the IKEA of bikes? Does it come in a flat pack box as well where all I need are some basic tools to assemble it?
  • 2 0
 What's the guy soldering in the 7th pic?
  • 1 0
 Looks like a strain gauge. Cool little instruments. Helps verify that what you've made is as strong as you expected. Or maybe that it's not...
  • 1 0
 Strain gauges , though we tend to embed them also these days , deep in that there laminate,
  • 2 0
 Sick AF
  • 3 4
 Sorry, but those carbon "straps" around the head tube look absolutely terrifying!!!! And I'm NOT a carbon hater at all. They just look SUPER sketchy!
  • 1 0
 This bike looks like it's made of bamboo - hmmm - bamboo fibres!
  • 1 0
 Orange Bikes, are you listening?
  • 1 3
 "Well, Compotech believes the bike industry to be very conservative..."
Says a company that uses a very conservative single pivot design
  • 1 1
 Fascinating but ugly as hell
  • 1 0
 Is it RAFL, or ROFL?
  • 1 0
 Looks like a geometron
  • 1 0
 ugly
  • 1 3
 Looks like a thermoplastic bike from the early 90's
  • 1 0
 No it doesn’t wtf, that’s injection molded
Below threshold threads are hidden

Post a Comment



Copyright © 2000 - 2021. Pinkbike.com. All rights reserved.
dv42 0.014472
Mobile Version of Website