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  1. #1
    mtbr member
    Reputation: FlippinSweet's Avatar
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    Shimano front chainring not compatible w/ RaceFace crank arm!?!

    I have a 34t shimano chainring that came off my brand new set of Saint cranks. I'm using a 32t ring for the Saints so I put the 34t on my RaceFace Evolve cranks; but the circumference of the bolt tabs on the chain ring is larget than the circumference of the recessed part of the spider arms on the cranks?
    Does that make sense? In other words the chainring does not sit flush on the spider arms because the recessed area (radius'd cutout) is too narrow of a diameter.

    Here maybe if I create some images that may help...

    At any rate, I'm just wondering WTF? Am I missing something? Why is this not compatible? If I want a 34t single ring (non ramped, non pinned) for my RaceFace cranks what do I have to get?
    Attached Thumbnails Attached Thumbnails Shimano front chainring not compatible w/ RaceFace crank arm!?!-chanring.jpg  

    Shimano front chainring not compatible w/ RaceFace crank arm!?!-crank.jpg  


  2. #2
    Nouveau Retrogrouch SuperModerator
    Reputation: shiggy's Avatar
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    grind it.
    mtbtires.com
    The trouble with common sense is it is no longer common

  3. #3
    29 some of the time...
    Reputation: AL29er's Avatar
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    Quote Originally Posted by shiggy
    grind it.
    I am with Shiggy, make it fit.

    I had a set of TV stylo cranks that required a bit of file work to make the Shimano rings fit onto. In that case I filed the crank arm as I intended to continue running shimano rings. If you are unsure, filing the ring may be more prudent.
    Quote Originally Posted by saturnine
    that's the stupidest idea this side of pinkbike.

  4. #4
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    yup and if you have shimano cranks and most aftermarket chainrings you end up with a gap in that location....

    no problem though

  5. #5
    Former Bike Wrench
    Reputation: mtnbiker72's Avatar
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    Quote Originally Posted by shiggy
    grind it.
    Been there, done that

    Same problem on Truvativ cranks

  6. #6
    Nouveau Retrogrouch SuperModerator
    Reputation: shiggy's Avatar
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    Quote Originally Posted by mtnbiker72
    Same problem on Truvativ cranks
    The problem is the Shimano ring, not the cranks. Shimano decided THEY had to make them differently than every other company. Of course they are also the ones that forced, for no good reason, the 104-4 bolt cranks on us in the first place.
    mtbtires.com
    The trouble with common sense is it is no longer common

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