Say I wanted to upgrade my stripped square taper BB and cranks to an isis or raceface BB and crank, could I do this on my 8 speed bike, since the more sturdy BB/crank combos are designed for 9 speed? or does it not matter at all? Thanks
The 9spd systems use a thiner chain and I think the chainrings are thiner. So you can use an 8spd chain on 9spd cranks and derailers. I have done just what your attempting with good results. I would not try an 8spd chain on a 9spd cassette. Thats where things get very particular. Your cassette, chain and shifters should all be the same spd.
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