Originally Posted by jimv

Actually, I think they're a pretty cool idea. I have a Mavic that I'm holding onto as a 'problem-solver' for the future. There's not much torque on any BB body or cup (unless your bearings are siezed) so that shouldn't be a problem. The BB shell has to be refaced to something like 45 degrees and the adjusting/locking rings have a conical face to match.

Basically, they're self-centering, chainline tweakable and remove thread compatibility (french/italian/english) issues. If you do manage to mung up the threads you just replace the BB not the frame or shell. So, does anyone know why all bikes aren't designed to use this type BB? Is there a drawback to these that I'm unaware of?

Jim