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  1. #1
    Im Hot for Leela cyclews's Avatar
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    9 speed cranks on 8 speed drivetrain

    My wife has a 2004 Gary Fisher Marlin. She would like to change the crank lenght to a 170mm from the current 175mm lenght.

    I have a new '04 RACEFACE DIABOLUS X-TYPE MOUNTAIN BIKE DH CRANKSET that is a 170mm in lenght. I am not using it and would like to put it on her bike to save some money.

    My question is..... Would this crank set work on her 8 speed drivetrain? The front and rear der. are both Shimano deore.

    Thanks

  2. #2
    Canadian eh?
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    The alignment may be slightly off...that's what I remember from the last time I attempted it. For the most part it'll work, but you may need a wider cage derailleur so the chain doesn't rub -- unless you don't mind rubbing.

  3. #3
    Senior Member SanDiegoSteve's Avatar
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    Worked fine for me, and when I went to 9 spd in the back, it was ready.

  4. #4
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    Since you have it, myswell try it...

    I recently needed to purchase an 8 speed crankset, which I found hard to find. I had read "The 9-speed chainring release teeth and pick-up teeth are re-profiled for the narrower chains. Therefore, you cannot use an 8-speed chain, and the pick-up teeth will make noise against the chain during minor cross chaining. " at http://www.worldcycleboise.com/techtips.htm and similar things at other places that suggested not to mix 8 speed and 9 speed parts, although my LBS said it would work fine to use 9 speed chainrings on an 8 speed drivetrain.
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  5. #5
    Year-round cyclist
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    AFAIK, SHeldon says it should work. Worst case scenario is that you would get some minor noise. If that is so, there is one easy solution:

    - Use a 9-speed chain.

    The 9-speed chain will work equally well with an 8-speed drivetrain, and for the price differencial, you will be able to buy a lot of 9-speed chains before you pay for a mew 8-speed crankset.
    Michel Gagnon
    Montréal (Québec, Canada)

  6. #6
    Im Hot for Leela cyclews's Avatar
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    Thanks for all the help.
    Fat guys can win Too!

    I will always love Leela

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