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  1. #1
    mtbr member
    Reputation: Ironchefjon's Avatar
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    9 speed cranks on 8 speed bike?

    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
    I live in Maine and I hate lobster.

  2. #2
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    Reputation: JSumner13's Avatar
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    It doesn't matter. It will be compatable.

  3. #3
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    Reputation: Ironchefjon's Avatar
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    what about rear derailleurs? Does bike speed matter?
    I live in Maine and I hate lobster.

  4. #4
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    As long as you set your high and low limit screws correctly a 9 speed derailleur will work fine with your 8 speed cassette.

  5. #5
    pronounced may-duh
    Reputation: Maida7's Avatar
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    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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