So, I have a frame with cracked/broken top tube - near the seat tube junction, about 2/3 of the way around. It's definitely broken though it seems to be holding together quite well due to the loads on the bike mostly compressing the tube in that area, except when you sit heavily on the saddle. As such, it's not something that's likely to fail disasterously or unexpectedly (giving that it's holding together right now with only a small part of it actually connected).
A replacement is on the way, but it seems a shame to bin the frame and tbh I quite like the challenge of this sort of thing so I reckon I'm going to give it a go at repairing it, particularly as I know other repairs that have lasted many years and are still going strong - one of the big positives about cf repair - do it right and it's very strong.
So, my plan is to get one of these kits (this is what they recommend for repairing bike frame tubes)
I'm pretty comfortable with the process but I do wonder how much carbon I should use and how to place it.
The obvious is to just wrap the cf ribbon around the tube and so long as the surfaces are properly prepared, then that should provide sufficient purchase to hold it in place.
I have considered wrapping the cf around the seat tube but that seems only necessary if you feel that it won't adhere to the tube otherwise.
And then how much do I use? 3 wraps? 5? 10? Anyone got any idea of the loads on a TT at that point or what number of plys frames would typically have there (and I know it'll be dependent on the strength of the particular cf I use but I should be able to find that out).
TIA. Consider this an experiment or part 2 of CynicAl's cf experimentation