Originally Posted by
Andrew R Stewart
1st choice - replace with the same kind.
2nd choice- replace with the same gear count and "tooth diameter"
There's some wiggle room, sometimes, with pulleys but duplicating origonal spec is always the best choice.
I disagree; IMO plastic BB pulleys with no float are always best, but then I have no love for Centeron-G; I think it's stupid. Just learn to adjust the indexing.
Also, bigger ones are quieter and perhaps slightly more efficient; I'd use the biggest that fit in the cage. I've gone +1 on the pulley tooth count a couple of times with no problems. Might affect B-screw adjustment, requiring more screw.