I'm rebuilding a 1996 Trek 7000 ZX SHX and a 1995 Trek 7000 ZX. Since I'm getting rid of the old STX/STX-RC cranksets, I also removed the existing square taper BBs. Strangely, both existing BBs seemed to be reverse threaded, with the fixed cup on the non-drive-side and the floating plastic spacer cup on the drive side!
One BB had markings I could read: Shimano Japan, BB LP-25, VIA 73, BC 1.37 x 24
The 7000 ZX is supposed to have a 73mm English thread BB shell, so that fits.
Speculating here -- maybe Trek wanted to adjust the left/right position of the spindle ends and it was cheaper to use this reverse-threaded BB than to change crankarms or frame? Any ideas? I'm just going to be putting in a normal Octalink cartridge with new crank on one, and external bearings/crankset on the other.
One BB had markings I could read: Shimano Japan, BB LP-25, VIA 73, BC 1.37 x 24
The 7000 ZX is supposed to have a 73mm English thread BB shell, so that fits.
Speculating here -- maybe Trek wanted to adjust the left/right position of the spindle ends and it was cheaper to use this reverse-threaded BB than to change crankarms or frame? Any ideas? I'm just going to be putting in a normal Octalink cartridge with new crank on one, and external bearings/crankset on the other.