Take the 2-minute tour ×  OK, so in my quest to get my old Trek
7000 ZX MTB running again after a long retirement, I am having
an issue with replacing the bottom bracket.  The bike came with
a Shimano LP25 that is marked BC 1.37 x 24. The spindle has LL
113 stamped into it.  So I ordered a Shimano UN55 BC 1.37 x 24
113mm.  They should be exactly the same size right? Well the new
one seemed to be offset to the right (drive side) by about 1/8
inch, even though the spindles are the same length.  Now my
front derailleur (STX-RC) won't shift to the largest outside
sprocket even when the adjustment screw is all the way out. What
can I do to correct this issue? I thought the only thing that
mattered when replacing a bottom bracket was the thread size
(68mm) and the spindle length.  Another strange issue is that
the orginal LP25 has the threads on the L side, while the new
UN55 has the threads on the R side. I could have sworn the
threads were on the drive side when I removed the bottom
bracket, but now I'm not so su