I have an older cr. moly Specialized Hardrock 17" frame, shimano 200gs components, 21 spd. I need to replace the bottom bracket. Does anyone know what size came on this bike?
Shell is the hole in the frame that the BB threads into, end to end. The Spindle length is literal. Its the square spinning "axle-like" part in the BB itself.
Heres a pic of how to measure Shell Width...