Linked Questions
34 questions linked to/from What do I do when I am unsure if damaged carbon fiber is safe to use or needs replacing or repairing?
2
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415
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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 ...
- 11k
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1
answer
303
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0
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1
answer
189
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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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1
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116
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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 ...
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1
vote
1
answer
109
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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 ...
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74
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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. ...
- 1
0
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56
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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 ...
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13
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5
answers
3k
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Can I trust my bike’s frame after I was hit by a car if there's no visible cracking?
I was waiting at a red light and the person behind me hit me. Her car ran over my rear wheel crushing it and over my frame. I have checked the frame were there are indications of her car but do not ...
- 131
11
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5
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8k
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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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7
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1
answer
4k
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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:
...
- 73
6
votes
2
answers
2k
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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 ...
- 277
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1
answer
6k
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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 ...
- 225
6
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2
answers
2k
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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, ...
5
votes
2
answers
6k
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How can I repair carbon damage near my bottom bracket?
I have had a few gnarly chain-drops that ate at my Open U.P. carbon frame. I thought I just had some chips in the carbon, but today I removed my crank for a full bike clean and realized that the ...
- 183
3
votes
2
answers
916
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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 ...
- 31
3
votes
2
answers
1k
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Should I be worried about potential chip in carbon near dropouts?
I just bought this bike second hand and I noticed this after. The chip is about 1/8 of an inch wide and about 1/32 deep. Is this a cause for concern?
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3
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3
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1k
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Is this a carbon crack or a scratch?
I'm about to buy myself a bicycle but the seller posted there's a slight scratch on the paint. Seems to me it doesn't look like a normal scratch but can be a crack on the carbon itself.
Is it a crack ...
- 31
5
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2
answers
993
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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 ...
- 51
3
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2
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991
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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. ...
- 515
3
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2
answers
1k
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Worried about chip in carbon road bike frame
I am planning to get a second hand medium range road bike and this is the first full carbon road bike I'm getting. However, upon checking the bike, I can see there is a surface chipping on the top ...
- 133
5
votes
1
answer
1k
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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
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1
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3k
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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 ...
- 441
4
votes
1
answer
523
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Is this a crack? Came off my Carbon frame for the first time
A guy on his phone just walked out in front of me into the bike lane and I plowed him at about 30kms. I walked away without a scratch and he absorbed most of the impact but my bike did hit the ground.
...
5
votes
2
answers
459
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R5 Carbon Fiber Seat Stay Tire Rub Damage
I have a 2012 R5 frame. This past weekend I put 25mm tires on the bike for the first time. All clearances looked good when I had it on my stand and when I tested the bike. I went out on a long ride ...
3
votes
2
answers
440
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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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1
answer
668
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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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1
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1
answer
257
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Lots of cracks - safe to ride?
I probably shouldn't have, but I just bought this 2016 CAAD 8 second hand for cheap. I'm trying to work out if it's safe to ride.
There are cracks all over the carbon fork (and in the rest of the ...
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3
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1
answer
278
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How bad/deep is this chip on a carbon fiber bike frame?
Does it cut into the fiber or just some paint chip?
- 249
3
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1
answer
315
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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 ...
- 153
2
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1
answer
223
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Chip in carbon seat tube?
I pulled out the seatpost on my Giant TCR and notice something like a chip in the seat tube, are defects like this normal?
- 21
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1
answer
242
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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 ...
- 597
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1
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121
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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,
...
- 9,606
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105
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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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Specialized Sirrus bicycle, fork cracked [closed]
I have a Specialized that was a gift, but have some problems at the front fork.
The fork is cracked, as per Photo:
Can someone help me to discover how to repair?
Other photos of the bike:
