bb axle length ?
hey all,
so i'm working on upcycling an old mtb. i had replaced the hub quite awhile back and thought i put a 123 mm bb in last time. i guess it was a little longer, measured about a 125 (i can't read it on the cartridge anymore). so i also replaced the cranks and chainrings, and dropped down a few teeth. the inner ring does not come close to the chain stay now (whereas with the old crank i had like 2 mm clearance or less). the new bb axle is 123 mm, and i'm wondering if you guys think it will cause any problems. just asking what the main difference is, and if it's ok to shorten that a little. want to ask before i change out the rear wheel and put on a new chain just to find i have some unforseen problem.
it looks like the chain line will be ok, so what's the big deal with having specific axle lengths?? just better for these super tight clearance modern designs?
thanks for any opinions and advice...
so i'm working on upcycling an old mtb. i had replaced the hub quite awhile back and thought i put a 123 mm bb in last time. i guess it was a little longer, measured about a 125 (i can't read it on the cartridge anymore). so i also replaced the cranks and chainrings, and dropped down a few teeth. the inner ring does not come close to the chain stay now (whereas with the old crank i had like 2 mm clearance or less). the new bb axle is 123 mm, and i'm wondering if you guys think it will cause any problems. just asking what the main difference is, and if it's ok to shorten that a little. want to ask before i change out the rear wheel and put on a new chain just to find i have some unforseen problem.
it looks like the chain line will be ok, so what's the big deal with having specific axle lengths?? just better for these super tight clearance modern designs?
thanks for any opinions and advice...