Originally Posted by
Retro Grouch
Inexpensive bike = UN-26. That's already a step up from what that bike probably came with originally. That nylon thing that everybody calls a "cup" is really just a bushing that keeps the cartridge from tipping inside of the bottom bracket shell. I've yet to see one have any kind of problem.
I kinda assumed that since since Shimano would not likely risk the reputational damage from BBs falling apart, even on the cheapest part of their line. Plastic on no-name parts I'd worry about, but Shimano seems to know just how to maximize margins without risking excessive failure rates. Thanks.