Big hole in top tube of new bike (Pics attached) aluminum repair with carbon fiber
11-24-20, 11:18 PM
#76
Senior Member
You're right, I had not read the whole thread. Sorry to be repetitively redundant.
11-25-20, 06:15 PM
#77
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You need to pay more attention to the swing on your machine.
11-26-20, 12:48 PM
#78
Member
Thread Starter
I will pass on making comments on the repair as I think that has been covered well enough.
However, it is Impressive that after sustaining that kind of damage the frame is still straight and rides well?
Not sure if the OP performed any frame alignment checks but I don't recall reading in the thread that they noticed any changes in ride or handling. Amazing.
I once hit a bike top tube w a car and it was bent and not rideable.
However, it is Impressive that after sustaining that kind of damage the frame is still straight and rides well?
Not sure if the OP performed any frame alignment checks but I don't recall reading in the thread that they noticed any changes in ride or handling. Amazing.
I once hit a bike top tube w a car and it was bent and not rideable.
The part I think is deceiving is that the second treatment of carbon fiber wasn't a long strip that got wrapped around three times. It was three seperate sheets that each got wrapped around once and the area on the side of the bike that appears to be slightly bowed out is exactly where those three layers all overlapped eachother so there was definitely more material on that side that I may have just not sanded down enough to match the other side.
Regardless, here are a few of the pics.
Setup:
See the the right side of the top tube (left side in the pic) slightly peeks out under the string a bit more.
Top down:
Last edited by Yellowlab; 11-26-20 at 02:33 PM.
11-29-20, 07:15 PM
#79
Senior Member
Yellowlab,
Regarding testing: The greatest stress on the top tube is a) in torsion while climbing with hard opposite pull on the handlbars, and b) vertical bending loads into the frame from a pothole/curb/jump at high speed, which would load the top tube in compression, and it has sufficient "slenderness ratio" (actual engineering term) to buckle. And further, buckling failure is a function of stiffness, not strength. Failure (a) will probably give warning signs in terms of inspection, you'll see signs of delamination. Failure (b), unfortunately, will not; Buckling failures are by their nature "catastrophic" (another engineering term), which means the start of failure weakens the tube which then makes it proceed further to failure. The same load on the tube in tension will do no such thing, it's much stronger in tension. This is just FYI, but I think you'll be OK. Clearcoat is smart. Plus it looks cool.
Regarding testing: The greatest stress on the top tube is a) in torsion while climbing with hard opposite pull on the handlbars, and b) vertical bending loads into the frame from a pothole/curb/jump at high speed, which would load the top tube in compression, and it has sufficient "slenderness ratio" (actual engineering term) to buckle. And further, buckling failure is a function of stiffness, not strength. Failure (a) will probably give warning signs in terms of inspection, you'll see signs of delamination. Failure (b), unfortunately, will not; Buckling failures are by their nature "catastrophic" (another engineering term), which means the start of failure weakens the tube which then makes it proceed further to failure. The same load on the tube in tension will do no such thing, it's much stronger in tension. This is just FYI, but I think you'll be OK. Clearcoat is smart. Plus it looks cool.
02-17-23, 09:21 PM
#80
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Can we get an update on this bike, OP? I can't imagine much bad happened to it being a trainer bike, but I'm still a bit curious.
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02-19-23, 02:07 AM
#81
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Hi reconnaissance, thank you for the feedback. I was backing the tractor into the shed and looking behind me to do so. When I cut the wheel slightly to adjust, the bucket which sits way out in front swung over enough that the tooth of the bucket was able to do this damage. Normally the bike is hanging on a rack out of reach so it usually isn't a concern. One of those situations where I forgot to hang the bike and the bucket was just at the exact right height and everything came together just right. Not my finest moment for sure.
Appreciate the comment regarding apparent garage logic, I would like to think you are right but my ego isn't such that I wouldn't get a second opinion which is why I'm posting here; to get the opinion of folks like yourself. Also, this bike will primarily be used as trainer bike during the winters on Zwift. I suppose I should have mentioned that in the OP. I have other bikes that I ride on the road so this one is likely to see very little if any real riding.
Thanks again,
Cliff
Appreciate the comment regarding apparent garage logic, I would like to think you are right but my ego isn't such that I wouldn't get a second opinion which is why I'm posting here; to get the opinion of folks like yourself. Also, this bike will primarily be used as trainer bike during the winters on Zwift. I suppose I should have mentioned that in the OP. I have other bikes that I ride on the road so this one is likely to see very little if any real riding.
Thanks again,
Cliff
Last edited by maddog34; 02-19-23 at 02:12 AM.
02-19-23, 02:48 AM
#82
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Thanks for sharing and very interesting way of repairing
