Bottom bracket threads on old frame
Hi guys, quick question.
I've got an older MTB (Schwinn Paramount Series 90 from around 1995) that I'm getting back into ridable shape. It's pretty much done, but the bottom bracket's shot. Someone overtightened the crank bolts, and stripped the threads out of the spindle.
Shouldn't be a problem, I've got a spare from an earlier upgrade.
However, the thing won't screw into the threads. The spare BB came out of a road bike. It's just a cheap square taper. THe threads on both the frame and BB look fine, they just don't match.
The original BB in the schwinn is the older style, not a sealed cartridge. They look pretty closely matched, but they're obviously not, since they don't thread.
Is there something I should look for when buying a new BB to make sure it's the right one?