Carbon bike crack seat tube

And you are putting stress in the area of the top tube and seat stay. You state you have been riding with a longer post. Have you monitored the cracks to see if they are growing? If the cracks are just in the top of the seat tube and have not grown I would ride. I doubt you are going to have the bike shatter under you.

I have a similar problem with my MTB and so far, I have ridden several hundred km and the crack remains the same. Good luck. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. Carbon frame cracks Ask Question. Asked 7 years, 5 months ago.

Active 6 years ago. Viewed 2k times. I went and bought a longer seat post and I have been riding the bike all season. Finally: Is there a proper way to frame the question so my wife will say "Yes" The last question was a joke :. Improve this question. Jeez, is old? There are specialists out there who offer carbon repair services, I'd recommend speaking to them. And if your wife already knows you have a carbon frame, I reckon you're halfway there!

Secondary menu. How to assess a cracked carbon frame. Stu Bowers 13 Apr Your ears, though, may be able to tell you more. See related.

The Cyclist guide to frame stiffness. Photo [above]. This is the second in four months, and this one failed after less than 25 rides. Both cracked in the seat vertical way. The frame is a custom-sized Serotta titanium that has over 40, miles, and the previous seatpost also carbon was the original.

The questions I have are:. It seems to me another carbon one will fail, too. Dear Harry, Yes, I certainly do have an opinion about why that has happened. Carbon fibers are very strong, and, while they can be quite flexible when dry, they become brittle when cured with resin into a matrix. In this case, it looks to me like the seat clamp at the top of the seat tube pinched the corners of the seat-tube slot into the fibers. Carbon fibers cannot take being crushed like that, and the carbon layers will crack and delaminate in response.

There are a number of ways to avoid this, all of which are intended to avoid the stackup of the slot and the tabs of the binder clamp together. If your frame has the binder tabs welded on rather than a separate band clamp , and your bike takes a I suppose there is one option with this situation, and that is to cut and file off the binder ears so that you can use a removable binder clamp on it, and then follow Option 2, below.