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Questions tagged [carbon]

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

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10 votes
5 answers
2k views

New carbon road bike - scratches discovered on chain stay

New carbon road bike (~1 month), rode less than 200 miles. When cleaning the bike, I discovered several scratches on the chain stay, near the cassette. Could this be due to a manufacturing defect, a ...
21 votes
1 answer
5k views

What do I do when I am unsure if damaged carbon fiber 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 ...
3 votes
4 answers
5k views

Aluminium Aerobars on Carbon Handelbars

Since I want to build up a new bike with road or gravel handelbars and aerobars I try to get as much information about it as possible. Now I have just watched a video where the person in it says (at ...
2 votes
0 answers
51 views

Lubricate between spoke nipples and carbon rim?

When building wheels, nipples should be lubricated so they can still turn easily under tension, towards the end of the build. When building a wheel using carbon rims, do you also lubricate the contact ...
2 votes
2 answers
820 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 ...
5 votes
2 answers
969 views

Wheel scratched carbon on ride

Wheel scratched carbon seat tube Hi everyone, Recently my wheel scratched my carbon seat tube as it loosened at the end of my ride. Was wondering if it is safe to ride. Imgur has 4 images, 2 are below ...
0 votes
0 answers
58 views

Carbon seatpost stuck due to damaged grub screw

I have an Orbea Orca 2024 with Di2 and the grub screw for adjusting seat height has potential thread damage and it won't come out. The bike mechanic explained that the reason the grub screw went so ...
6 votes
5 answers
35k views

How to repaint a Carbon bike frame?

I have recently purchased a Specialized Roubaix SL4 Elite Disc carbon frame bicycle—But I am not particularly happy with the colour. It is charcoal and white. I like to have a brighter colour. Is ...
3 votes
1 answer
255 views

I suspect that my carbon fork has a crack but I can't really tell

I've relocated to a new town so I'm still looking around for good bike shops. For the time being as I was re-assembling my stem, i noticed a small notch of about 0.5mms on the front of my fork (the ...
5 votes
5 answers
20k views

How to pull a carbon seatpost out of a carbon frame?

How do I pull out a carbon seatpost on a carbon frame? It seems so hard for me... Do I need a special tool, or just ask help from a local bike shop? done with the seatpost. I made the frame and fork ...
3 votes
1 answer
206 views

Super-glue for minor scrapes on carbon fiber frame - below the top-coat

I scraped my frame on a curb about 1 mm deep in a couple places near the rear axle. (it's a 2021 TREK Domane SL-7). Another post stated that chopper pilots routinely use super glue and baking soda ...
30 votes
2 answers
16k views

Road bike carbon fiber frame life span

I have read in several places regarding bicycle frames that carbon fiber has a shorter life span than aluminum, and I was wondering just what would it be. I am not referring to accident-related ...
0 votes
1 answer
109 views

Paint chip or carbon crack [duplicate]

Looking at this bike to buy but I’m 3 hours away from where it is. Not sure if it’s a paint chip or a carbon crack, I asked how it happened and he said he was carrying it upstairs with his bike pump ...
6 votes
4 answers
1k views

Cracked Carbon Seat Tube

I was riding when my seat tube cracked as I rode over a hump. Are there any possible fixes for this like epoxy, sanding, or something? I'm losing sleep over this.
3 votes
1 answer
748 views

Wear marks on seat stay from fender/mudguard. Problem?

Mudguards have worn away where they contact the seat stay on carbon frame. A little deep, wondering if cosmetic or more serious. The one on the right stay doesn't look as deep but you can see 3 ...
1 vote
1 answer
104 views

Carbon frame damaged? [duplicate]

I had a crash a couple of weeks ago with my BH Quartz. The front wheel got caught in a crack in the road, I heard a crack and I fell on the side. I was worried that the frame cracked, but couldn't ...
2 votes
2 answers
2k views

Carbon bike for commuting - concerns about durability

I have been riding an aluminium frame hybrid bike for 20+ years and it is coming to the end of its life. Having tested a couple of carbon hybrid bikes and been very impressed with the responsiveness ...
4 votes
0 answers
560 views

Mavic Cosmic SLS - carbon separation

Some aero’ wheels are an aluminium rim with a carbon fibre shroud. On a Mavic Cosmic SLS rear wheel, I’ve found that the carbon fibre shroud is separating from the aluminium rim. Just visible in the ...
4 votes
2 answers
4k views

Tightening steerer expander/compressor and spacer positions with a carbon fork

I had ugly clicking noises coming from the headset before and after a warranty exchange of a fork (the reason for the exchange was on the other end). I have identified the clicking as coming from the ...
4 votes
2 answers
1k 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 ...
-4 votes
1 answer
101 views

Is it possible to prove that applied forces to a top tube are worse than a seatpost when using a repair stand clamp?

This stems from the idea that you should use a bike stand clamp on a seatpost, if you can, for carbon fiber (CF) bike frames. Hopefully, this would avoid the cracking of a CF bike frame. In order to ...
5 votes
1 answer
971 views

Shallow ring of death

By not servicing the headset for a long time (>10K km), I ended up with the so-called ring of death on the steerer tube. If you have never heard of it, watch this ...
29 votes
12 answers
64k views

Carbon bikes make me nervous. Can you ease the tension?

Is it only me, or do Carbon bikes make others nervous! I realize that carbon fibre is strong, but for some reason, having a bike that isn't made out of metal seems like asking for trouble. My main ...
14 votes
2 answers
9k views

Felt carbon steerer compression plug removal

How do I remove a compression plug (aka. expander bung) like this one? Most guides I could find assume that there's a 6mm hex Allen opening that allows tightening/loosening the plug (example pictured ...
3 votes
2 answers
173 views

Carbon Damage on bridge, repair possible? If so, what steps are needed?

This is a follow up question to: Attachmentpoint rim brakes carbon bike, sratches/crack? So. My bridge on my x lite 4 seems to be delaminating. Unfortunately Rose does not want to honor their six year ...
3 votes
1 answer
550 views

Should I use fiber grip or grease when installing a bottom bracket into a carbon frame?

I am assembling my first carbon road bike and came across a question regarding on how to install the bottom bracket. I decided to go for this Ninja BBRight for my Cervelo Caledonia. The Token's ...
6 votes
2 answers
674 views

Attachmentpoint rim brakes carbon bike, sratches/crack?

I own a 2019 Rose XLITE carbon road bike with rim brakes. Today, I conducted a thorough inspection, taking things apart. At the rear of the bike, on the attachment point where the brake is fixed to ...
2 votes
1 answer
251 views

Noticed a small scratch in the integrated crown race of my carbon fork. How fragile is this part of the fork?

I recently had to take apart the headset of my Cannondale Caad 13 road bike due to some clicking noises I wanted to diagnose. Therefore I also pulled out the fork a bit to inspect bearings and ...
4 votes
4 answers
2k views

Are cleat backing plates for protecting carbon sole?

I've just bought my first MTB shoe that has carbon sole. When I wanted to put on the SM-SH51 cleats, I saw that it has some claws, that would (in my opinion) damage the carbon sole of the shoe. So I ...
-1 votes
1 answer
46 views

How much does GT zaskar carbon comp cost? [closed]

So i checked the bicycle GT zaskar carbon comb and its prize was 22k rupees and in other websites it cost more. What is the real price and is there any GT zaskar carbon comp for 22k rupees 22k rupees =...
3 votes
1 answer
244 views

Is the carbon frame disposal problematic

I heard from someone that carbon is difficult to dispose of. Does anyone know how to dispose of carbon frames?
3 votes
1 answer
359 views

Carbon rim depth - 44 or 56mm?

I'm looking for recommendations on carbon rim depth considering my use case. Inner width is 23mm and I'll be running 32mm tubeless. For 3 season use in the UK, mostly on (rougher) roads - some hills, ...
0 votes
0 answers
56 views

Damaged carbon fibre [duplicate]

My chain dropped and got stuck in my bottom bracket while I was going uphill. I think the force from the pedal stroke damaged the carbon fibre. Wondering what is recommended when something like this ...
0 votes
0 answers
140 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 ...
8 votes
2 answers
5k views

Do carbon MTB frames crack easily?

I have been looking to buy a new full sus mtb (Vitus sommet 29 Cr) and saw that the main frame is carbon fibre with the rear triangle being aluminium. I love the bikes specs and aesthetics but can't ...
11 votes
5 answers
7k 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 ...
0 votes
3 answers
3k views

Building a carbon gravel bicycle - Shimano 105 7020 vs GRX RX600/800

I've got into cycling around 2 years ago, mainly going to the office and cycling around the city/when traveling. Thing of 2 months ago started with long-distance and speed experimentation, and ...
31 votes
6 answers
65k views

Why is carbon fiber inherently weak? Or is it?

This question got me to thinking: If it were possible for me to use a carbon frame, I would, but the expense and my riding style keep me using steel and aluminum. (I like hauling stuff on racks and I'...
3 votes
2 answers
879 views

Carbon chainstay damage assessment

Is it likely that the carbon is fractured based on my pictures, making it unsafe to ride? I discovered an odd, oval-shaped scratch on my chainstay. I remember my bike being knocked over on the asphalt ...
2 votes
1 answer
524 views

Grease carbon fork before crown race installation?

I have a carbon fork, and a crown race that fits a sealed cartridge headset bearing. I know that in installation of crown races on metal steerer tubes, the use of grease is recommended. I am wondering ...
4 votes
2 answers
2k views

Glue for carbon fibre

Can anybody recommend a glue (perhaps a type of cyanoacrylate) for bonding carbon fibre? I'm not looking for advice on how to do the repair itself. I just want to know what brand or type of product (...
7 votes
1 answer
496 views

Tightening a compression plug - manufacturer says 9-12 Nm, seems too tight at 6 already

First time working with carbon. Bought a longer compression plug, because it came with a very small one, not even covering the whole height of the stem. I tightened it to 7 Nm. Took a while… Made ...
3 votes
2 answers
896 views

At what level of carbon fiber damage should you have it checked at your LBS?

Today I was clumsy and managed to hit my carbon fork against a fence while lifting the bike over it. There's just a tiny ding, almost not visible without a magnifier and superficial scuffs around it. ...
-2 votes
4 answers
254 views

Confidence in carbon bike frame after sealed bearing replacement

You buy a new bike. The bottom bracket makes a funny noise and needs replacing. For many other product categories (computer with a noisy fan, ...), you'd worry you had a lemon on your hand. It would ...
3 votes
2 answers
865 views

Can large bike size will be solved by replacing the crank arm with a longer length?

I recently bought a carbon fiber bike and the size is a bit big, it's sava phantom3.0 56cm ,but I love the bike and don't want to wait too long for small size bike, would a longer crank arm be a good ...
2 votes
1 answer
226 views

Any help identifying a Focus carbon Izalco with SRAM Red?

Buying a bike from an online listing, and trying to find some information on it. I researched Focus's serial number formatting, but since the release of this bike it has changed, and the serial number ...
0 votes
1 answer
118 views

Does carbon prevention spare a cure?

This site gets, with some regularity, questions wondering whether some small damage to a carbon frame affects the integrity and the safety of riding that bicycle. Here is a chronological sample: 01, ...
4 votes
2 answers
977 views

Do you agree it's safe to continue to ride this carbon bike with a small crack in the frame?

As you can see in the pictures my carbon bike has a crack in the frame, between the seatpost and the corresponding screw. I'm told by my bike shop and by an engineer of the bike manufacturer that I ...
2 votes
2 answers
422 views

Unsure if my carbon steerer got damaged from riding with stem attached in wrong position

I am worried that my steerer is damaged and don’t really know what to do, because I feel insecure riding my bike now. I hope maybe you can help me to determine what I should do. I was at a bikefit and ...
5 votes
3 answers
577 views

How should I deal with this splintered carbon steerer?

I made a bit of a mess of my fork's carbon steerer while cutting it: I deliberately cut the steerer around 10 mm longer than I needed it. While cutting, the steerer was secured in a stem up to this ...

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