/r/bustedcarbon
All your busted carbon goes here!
Post your pictures and share stories of busted carbon fiber. Preferably bikes and bike parts, but all busted carbon is welcome!
This is also a place to ask for advice for repair or if you think your carbon fiber parts might be damaged.
All your busted carbon goes here!
Post your pictures and share stories of busted carbon fiber. Preferably bikes and bike parts, but all busted carbon is welcome!
This is also a place to ask for advice for repair or if you think your carbon fiber parts might be damaged.
/r/bustedcarbon
3,159 Subscribers
Scratched downtube or crack?
00:33 UTC
How busted is this and can/should it be fixed?
09:38 UTC
Cracked Fork or Paint Damage?
09:25 UTC
Damaged Frame
Hi everyone,
I’d appreciate your advice on a situation I’m facing with my Canyon Lux carbon frame.
Recently, I discovered damage on the frame (06/01/2025), and after contacting Canyon, they denied my warranty claim, citing external impact as the cause, hence the bike have never crashed or was involved in any accident in any shape or form. According to their assessment, the damage is not due to a manufacturing defect.
I’ve since consulted with a carbon frame repair specialist who inspected the frame and believes the damage is only superficial, with no structural impact. The repair, including repainting, would cost approximately €200, which is significantly less than the €1500 required for a new frame through Canyon’s crash replacement program.
My questions are:
- Are there any risks or drawbacks to repairing a carbon frame?
- Would the repair impact the long-term reliability of the bike?
- Would it make more sense to opt for the crash replacement program instead?
I’d love to hear from anyone who has experience with carbon frame repairs or has faced a similar situation.
Thanks in advance for your insights!
photos can be found on the following link: https://photos.google.com/share/AF1QipPICwPt4WmLqQjF4pyXjDdGtZNyjmJPlGeGAqTgNJEHIwdk06zJPSklF6ta25fhlw?key=UG96LUpxX3ZKMmhUMncwN1B4b1NtWTZ0QU9mWmZ3
10:20 UTC
Broken or cosmetic?
Just received this mcfk saddle and installed but noticed these marks on the left rail, did not over torque, max says 5 and went to 5 with torque key.
23:16 UTC
Carbon frame damage from a kickstand mount, how bad is it?
Hey guys, I've got a hell of a story to tell you.
My very rich uncle got himself an e-bike - BMC Fourstroke AMP LT THREE (https://bmc-switzerland.com/collections/mountain-e-bikes/products/fourstroke-amp-lt-three-bikes-bmc-24-10204-002).
Now, the sad part is he just got the most expensive bike he could find and never even used it!
Unfortunately, he kept it in his garage for over a year and kept adding random gear to the bike... And yes, he did try to convert this trail-racing e-bike into a... city e-bike
So, I can buy the thing right now for literally half the price. It's never been used. I tried it out, and it's amazing.
But I've got one big issue with it. I managed to get rid of the bicycle basket, four different displays, and the silver bicycle bell, but when I removed a cheap kickstand, I realized the frame is scratched where it was mounted. I've never had a carbon bike before, but I assume that's rather bad, as I can feel the fibers when I touch the area.
So my question is... Is this something I should worry about? How serious is it? I won't lie, I'm rather lightweight (70 kg / 154 lbs), and I won't hit the bike hard, but if the frame is damaged, I wouldn't want it to break or something while biking down a mountain.
(I wouldn't even worry at all about this scratch if it weren't carbon, but I read a bit on the topic and got a little paranoid.)
00:29 UTC
Busted Campagnolo Bora Ultra 45
Attacked by a pothole, unfortunately, 4 week old wheels ruined by a spot of bad luck.
01:09 UTC
Brand new bike cracked?
I purchased a new bike today at my local shop. When I arrived home I noticed a weird bump on the left of the seat post, where the clamp is. The right side does not have the bump and it's perfectly smooth (see pictures).
Is this a crack? If yes, how did the guy fitting me on the bike not notice it? It seems they deliberately ignored the issue to get rid of a damaged bike.
Edit: forgot the pictures.
04:21 UTC
Chip and a line on carbon
Was replacing a pedal when my Allen wrench accidentally slipped and hit the top of the downtube. Chipped the paint and created this line. Thoughts?
09:47 UTC
Carbonwheels with a pulled spoked
#spokes #spoke repair #carbon #fiber
13:27 UTC
Middle of top tube cracked during ride, manufacturing defect?
00:40 UTC
About to Buy a Bike
What do we think
10:36 UTC
Rock chip on new-to-me ENVE front wheel.
Was pace-lining and had a rock kick up and hit the front wheel. Disc brakes. Size about the size of a grain of rice.
I was able to finish the ride and wheel/tire still holding air with no issues. I emailed ENVE already but wanted to hear from the Reddit experts.
20:11 UTC
Chain drop
2nd ride on the new bike… is this just cosmetic?
01:55 UTC
Paint? Carbon?
Opinions please - I have an Email in to the manufacturer, and will have a guy at the bike shop take a look as well, but what's anyone's opinions on these pictures? Noticed this "crack" or "mark" today when I cleaned up my bike. Did the coin test and it passes. I am the original and only owner, bike has not been crashed, and has not had any impacts that I am aware of. Area is on the seat tube, non-drive side, about 1 to 2 inches down from where the seatstays join the seat tube. Bike is a Pinarello Dogma F12.
Have also been looking around for carbon repair options depending on what is discussed at the shop.
01:30 UTC