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  1. #1
    Aluminium Crusader :-)
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    will 8 speed rings fit on DA 10sp cranks?

    echo echo

    I have a bike with all 8 speed stuff, and I'm having trouble getting 9 speed DA 180mm cranks, but 10 speed 180s are readily available

  2. #2
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    The 10 spd Dura - Ace has a BCD of 130mm. Check yours, this should work in a pinch, but remember, an 8 spd chain on a 10 spd ring might result in some weird shifting going on!

  3. #3
    Aluminium Crusader :-)
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    thanks.

    I've been told that an 8sp chain won't work on 10sp rings, but 9sp will.

    I've seen 9 speed rings on 10sp cranks, but I'm still not sure if the 8sp rings will fit.
    I can't imagine that the BCD would've changed.

  4. #4
    Senior Member sydney's Avatar
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    Quote Originally Posted by cort
    .. but remember, an 8 spd chain on a 10 spd ring might result in some weird shifting going on!
    Why??

  5. #5
    Senior Member sydney's Avatar
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    Quote Originally Posted by 531Aussie
    thanks.

    I've been told that an 8sp chain won't work on 10sp rings, but 9sp will.

    I've seen 9 speed rings on 10sp cranks, but I'm still not sure if the 8sp rings will fit.
    I can't imagine that the BCD would've changed.
    The BCD hasn't changed. If chain 'speed' really bothers you, use a 9 speed chain.

  6. #6
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    As you go from a 8spd chainring to a nine speed ring, the inner chainring is displaced slightly to the right, and is even more pronounced in a ten speed ring. This "displacement" is done to accomadate the norrower chain. So when you have a bigger chain (8spd ) jumping down from the 10 speed 52 to the 39 -the chain could overshoot the teeth ( ie: sloppy shifting)

  7. #7
    Aluminium Crusader :-)
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    hmm....I see

  8. #8
    Senior Member sydney's Avatar
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    Quote Originally Posted by cort
    As you go from a 8spd chainring to a nine speed ring, the inner chainring is displaced slightly to the right, and is even more pronounced in a ten speed ring. This "displacement" is done to accomadate the norrower chain. So when you have a bigger chain (8spd ) jumping down from the 10 speed 52 to the 39 -the chain could overshoot the teeth ( ie: sloppy shifting)
    I don't think there was any change fron 9 to 10 and from shiamno 8 to 9 the teeth were angled slightly inward. Shimano has never insisted you need the specific rings for the application, and I have found that to be true in actual use.

  9. #9
    Senior Member sydney's Avatar
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    Quote Originally Posted by 531Aussie
    hmm....I see
    Yeah, but don't go to the bank with it.

  10. #10
    Aluminium Crusader :-)
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    Quote Originally Posted by sydney
    Yeah, but don't go to the bank with it.
    hmmmm......I see

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