pete75 wrote: From your description it sounds as if they want to replace the bottom bracket not the chainset, so do they mean the crank is glued onto the bottom bracket axle or the left hand bottom bracket cup is glued into the frame with epoxy. If the latter anything that dissolves epoxy is also likely to dissolve the frame given it's made from carbon reinforced resin.
I'd have though a carbon frame with an epoxied in bottom bracket is effectively a write off once the BB is no longer viable.
With steel it's a different matter as heat could be used as a last resort.
in some cases the LH cup can stay in place whilst the rest of the chainset and BB are replaced. You don't say what kind of BB and chainset you have exactly (truvativ make dozens of different models) but if you can post a picture then maybe someone can help.
If you have an H-II type BB unit then you can usually leave the LH cup in place and still change the bearing itself. Arguably the net result isn't that much different to a BB30 type BB unit, where the bearings press into the frame itself.
BTW how does the LBS know that the threads are damaged in the frame? It is a fair guess if the LH cup is glued in I suppose, but still a guess.
It may be possible to mechanically remove the parts from the frame and then bond a replacement in, or use a threadless BB unit. Whilst these are not ideal solutions, it can at least allow you to have a functional bike.
cheers
