Questions tagged [carbon]

Frames or components made from carbon fiber, possibly even about carbon accessories.

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Carbon fork - removed exapnder plug before loosening stem

So I forgot about the correct procedure and removed the expander plug on my carbon fork before unfastening the stem's bolts (carbon-specific stem, 5 Nm, unscrewed stem right after removing plug, and ...
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  • 387
4 votes
1 answer
313 views

Replacing internally routed cable with no access holes

I have this 2013(ish?) Vellum Uno on which I'm trying to replace my front derailleur cable. I was unable to do the yarn trick where you tie a piece of string to the cable before pulling it out (the ...
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1 vote
2 answers
100 views

A vibration with a loud grinding sound may start at speeds over 35hm/h on my 12-year-old carbon fibre road bicycle

The problem began last summer about 2 hours into a ride on rolling hills when I went over a small but sharp bump across road. I have tried to identify and repair problem since then. I have replaced ...
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  • 11
0 votes
1 answer
81 views

Cracked carbon frame near seat post

A thick crack has appeared on the rear side of my carbon frame near the seat post. The crack formed after adjusting the seat post to the maximum recommended height. How might this have happened? Is ...
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4 votes
2 answers
639 views

How to restore broken rear disc brake mount in carbon frame?

Look at the image: Bike model is Rocky Mountain Vertex 990. The frame is broken in a way that it's impossible to install rear disc brake. Possibly there may be a frame deformation. Is it even ...
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1 vote
1 answer
59 views

Carbon Fibre Bike Re spray

I have a carbon fibre bike that i am looking to get re sprayed I have found a powder coating company near me Profin can you actually paint fibre or will it need to be wet sprayed??
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3 votes
1 answer
341 views

Overheating: Are Latex inner tubes on rim brake carbon wheels safe?

Currently I'm using standard butyl inner tubes on my clincher carbon wheels. My bike uses rim brakes, and searching on internet I have found that carbon rims are not great for dissipating heat: ...
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7 votes
1 answer
892 views

Chain damaged carbon frame. How to remedy?

During a recent fall, my chain came off my front chainring, and scratched up my frame. It looks to me like it's just the paint that's damaged but would appreciate a second opinion. The bike is a Trek ...
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7 votes
3 answers
2k views

Does carbon fiber not have a fatigue life?

I’ve heard carbon fiber “has no fatigue life”, meaning it doesn’t weaken from (intended) use, as long as it is free of defects and damage. But there are a lot of different types of carbon fiber… I was ...
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8 votes
4 answers
1k views

Do I need to apply something on thru axle?

I've just bought my first carbon frame roadbike and realised that it has thru axle (previously I had quick release). Before I would do anything stupid, could someone give me advice if I should apply ...
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  • 403
2 votes
2 answers
224 views

Possible damage in carbon fork of used road bike I'm about to buy

I'm about to buy this used Giant TCR (year?) road bike, but I noticed it has a raised mark on one side of the fork. The bike shop knows nothing about it and it seems structurally fine. May it look ...
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  • 121
0 votes
1 answer
56 views

Help pick between BMC and Diamondback 29er hardtails [closed]

Looking to get a new 29er hardtail with a carbon frame, down to 2 options, need some help deciding. My most typical riding use case is get out early in the morning, do 20-90 miles on a mix of paved, ...
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  • 171
2 votes
2 answers
130 views

Structural Stability of Carbon Rim

I recently purchased some carbon rims for my road bike and there appears to be some buldging forming around the rim. I'm no expert in carbon fibre and I was wondering whether the wheel is still safe ...
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  • 121
11 votes
4 answers
3k views

I'm not sure if a torque wrench was used in assembling my carbon bike

I was given a brand new carbon mountain bike by my uncle, he assembled it himself about 18 days ago. My problem is that I am not sure if he used a torque wrench when he assembled the bike. I would ...
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2 votes
2 answers
106 views

Carbon rim white after applying Gorilla super gel glue - cause for concern?

Rode over a big nail the other day which not only went through the (tubeless) tyre, but also made a significant hole in the rim. Before retaping the rum, I applied Gorilla super gel glue yesterday to ...
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  • 722
1 vote
0 answers
60 views

Looking for a entry-level carbon 29" hardtail in US - where to buy? [closed]

looking for a new bike and decided that 29" hardtail with good carbon frame is the way to go. I am looking at $2000-3000 budget, and it seems that I can find something within this range if I look ...
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  • 171
0 votes
1 answer
93 views

Carbon Bike Frame Chip At Rear Wheel [duplicate]

I was wondering if this is fixable?
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4 votes
2 answers
246 views

Rim brake mark on carbon disc wheels. Are they unsafe?

So I purchased this wheelset a while back for a CX build. When they arrived I could see that the previous owner had tried to run them with rim brakes, leaving a mark on the carbon rim. The rim brake ...
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1 vote
0 answers
48 views

Most appropriate roof rack style for carbon framed mountain bike?

I have a CC Carbon Santa Cruz Hightower, which I would very much like to look after the frame. I have read in a couple of places that it can be dangerous/damaging to clamp onto carbon frames, so does ...
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  • 1,056
0 votes
0 answers
77 views

carbon frame bike ktm revelator 4000 2017 damaged

KTM 2017 revelator 4000 in the bottom of the frame I have noticed this failure/puncture. Would you trust the damage here in the picture?
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3 votes
1 answer
148 views

Carbon fork steerer defect?

Any carbon experts out there? I have zero experience with carbon-* anything. A brand new unused monocoque CF fork arrived from the manufacturer. Steerer has an imperfection in it. Very difficult to ...
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7 votes
1 answer
2k views

Is it safe to ride the carbon bike with a small crack on the bottom of the chain stay? Looks cosmetic but fails the tap test

The chainstay cracked after air travel. Update: I have brought the frame to a carbon repair shop for repair. The cost would be 500ish, including the touch-up paint. Tips for future flight travelers: ...
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  • 73
4 votes
4 answers
253 views

Reconciling the two aspects: carbon is stiffer for power, but offers a softer ride

At times composite (carbon) is touted as being stiffer than (aluminum) alloys as well as stiffer than steel (leaving Titanium to a different discussion). This means that the frame will not yield (much)...
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  • 4,049
7 votes
2 answers
1k views

Scratch or Crack?

I'm curious on opinions if this is a crack or a scratch. No crashes. No drops. Yes creaking.
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1 vote
1 answer
244 views

Water bottle rivnuts preventing dropper post getting low enough, carbon frame

I didn't realise this bike had a second set of drink bottle bolt holes on vertical length of the front triangle, they're stopping the seat post getting as low as I would like it. If I drill the ...
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  • 27
2 votes
3 answers
160 views

Carbon fiber aesthetics vs. poor craftsmanship vs. possible repair? [duplicate]

Today a N.O.S. 2016 Stumpjumper FSR carbon frame set arrived, and I'm not impressed with some aspects of the way the carbon fiber front triangle appears. My CF experience is limited having only owned ...
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  • 6,868
6 votes
2 answers
1k views

Post crash damage assessment: can I keep this carbon fork and this front wheel?

Today I crashed. I had to slam the brakes hard downhill as to avoid a worse crash. Split second decision, it's the way I explain it. As a consequence I went over the handlebars. Landed not too poorly, ...
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3 votes
2 answers
212 views

Brake damaged carbon frame — what to do?

I packed my Edmonda SL5 carbon frame for a road trip. In the bag, the front brake touched the frame and left a mark — definitely deeper than just the paintwork. It's unclear how deep the damage is to ...
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  • 33
0 votes
1 answer
80 views

Carbon crack or cosmetic damage? [duplicate]

I have a new bike and after a bikefit (it was causing me kneepain) I had to raise the saddle and noticed a crack. I only use a torque wrench and tighten it to 4Nm usually so I can't overtighten (4.5 - ...
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  • 61
0 votes
0 answers
71 views

Carbon Specialized Sirrus X5.0 Help

I am very new to this thread and seeking help from an experienced bike enthusiast. I just purchased the aforementioned bike in the title and after bringing it home for inspection(bought brand new from ...
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4 votes
3 answers
2k views

Falling over on carbon frame bike -- likely to cause damage?

As per my last post, I'm learning how to use clipless shoes. First 3 days of practice went fine, but on the 4th I came to a stop and couldn't get my foot out in time -- in truth, I got one foot out, ...
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  • 487
6 votes
2 answers
2k views

Is my carbon frame done?

I have a carbon trek Emonda bicycle. Today, my rear derailleur got caught in my wheel. As a result, the rear derailleur is bent, the rear derailleur hanger snapped off, the chain got twisted and the ...
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1 vote
1 answer
154 views

Cosmetic or structural damage to Carbon Crank Arm

So I have a carbon fibre SLK Light Crankset and I managed to scratch up the right crank arm and the end has chipped off. I was wondering whether this is structural damage or cosmetic damage. It has ...
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  • 11
13 votes
1 answer
2k views

What do I do when I am unsure if a carbon fiber component is safe to use or needs replacing or repairing?

Intended as a canonical answer to the many questions we have about damage to carbon parts. It is well known that carbon fiber parts can be damaged and fail, and carbon parts can be fragile when ...
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  • 39.3k
3 votes
2 answers
3k views

Chips in carbon frame - how worried should I be?

I am looking for a second hand road bike. This is to be my first mid-range bike, and my first introduction to carbon frames. I have done a bit of research, and am aware of the potential risks of ...
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  • 179
0 votes
0 answers
70 views

Are these scratches at carbon fiber something to worry? [duplicate]

the seller showed me all the scratches at the bike and told that they happened when he was carrying bike and & changing rear wheel all the time. I did not notice any other scratches at the frame. ...
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1 vote
1 answer
272 views

Carbon or paint crack

Does this crack look cosmetic or structural to you? It's tiny hairline thick. UPDATE: I took the bike to trek store and their technician looked at it (I think he simply did tap test) and said he ...
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  • 11
4 votes
1 answer
199 views

Matt black carbon bike

Just want to ask about the finish of matt black carbon bike. I bought a brand new specialized carbon bike. And the surfaces are like the images. I thought it’s kind of smudges or smears that could be ...
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  • 41
2 votes
2 answers
4k views

What should the torque of an expander plug in a carbon fork be?

What torque should be used for the expander plug in a carbon fork? This one shows 8NM, which seems high Manufacturers rarely seem to supply this information, yet tightening too much could damage the ...
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  • 737
3 votes
1 answer
160 views

Is 2kg static cross-load dangerous for a carbon frame?

The bicycle is a carbon fiber cross-country machine. It is from a local manufacturer, not a well known one. Compared to other CF bikes but for more aggressive riding, when I knock on the tubes it ...
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  • 12.6k
2 votes
3 answers
899 views

Damaged Carbon Steerer Tube, repair/replacement?

I cracked the top of my 2007 Schwinn 1 1/8 fork black label steerer tube. What kinds of repair are available? Should I just buy a new name-brand carbon fork, e.g., Canondale, GT, Trek on ebay?
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1 vote
0 answers
225 views

manufacturing debris inside carbon fork steerer tube

I bought a 90mm compression plug so it would extend about 30mm into the bike's head-tube. But when the carbon steerer tube was cut to desired length, the compression plug could only be inserted to ...
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  • 886
8 votes
2 answers
1k views

Frame dropout cracked, what can I do? (Allied Alfa Disc / carbon)

The frame thru axel hole/dropout cracked while using my wahoo kickr trainer. Is this crack dangerous? If it is, what can I do?
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  • 223
3 votes
1 answer
257 views

Canyon ULT and Wahoo Kickr

Bought a wahoo Kickr in November and noticed a small chip to my canyon ultimate carbon frame. In January, Canyon announced the Ultimate was not compatible with Kickr. I'm dealing with Canyon and Wahoo,...
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2 votes
1 answer
293 views

Recommendation for Carbon Hybrid Bike [closed]

After some trial and error (see another post of mine), I finally settled in on getting a carbon hybrid bike. I want carbon because it is lighter and I want a hybrid because I prefer a flat bar (just ...
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  • 289
4 votes
1 answer
166 views

Slotted or unslotted crown race with tapered carbon steerers

Does a tapered carbon steerer (40mm at the crown) typically require a slotted crown race if the steerer lacks an integrated bevel on which the lower bearing can rest? I have a Cane Creek Forty headset ...
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  • 886
2 votes
1 answer
83 views

Product compatability (bottom bracket and frame)

I love biking, but I'm really no mechanic. I currently have a Shimano M6100 groupset (Deore) with me. A friend is going to give me a good deal on a carbon MTB frame, but I'm worried about ...
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  • 21
0 votes
3 answers
752 views

Should an integrated crown race of an carbon fork be greased before assembly?

I'm assembling a 3T Exploro Team 2020. It seems like the fork has an integrated crown race. Should it be greased before assembly and pre-loading?
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  • 722
9 votes
2 answers
790 views

Are these shallow gouges and imperfections on a new carbon fork steerer benign or serious?

I have never had a carbon component on any of my bikes, so I have no idea what sorts of imperfections are perfectly normal minor blemishes that pose no risk. I'm building the bike for a family member ...
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  • 886
1 vote
2 answers
218 views

Aerobar, why would carbon cost more than aluminum?

I think carbon parts are generally more expensive to their aluminum counterparts. I'm perplexed because aluminum version is cheaper and weighs less too? What am I missing? Example: Profile design ...
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