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  1. #1
    Senior Member YATES's Avatar
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    different size FD

    I'm in the process of buying an SRAM rival FD. I'm also unfamiliar with certain aspects of bike mechanics.
    Anyways. Whats the difference between the 31.9mm and the 34.9mm FD? does it really make that big of a difference?

  2. #2
    Pwnerer Wordbiker's Avatar
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    It does if your seat tube diameter is 34.9 and the derailleur clamp band is 31.9mm.

    Take a caliper and measure the tube diameter before ordering.
    Quote Originally Posted by ahsposo View Post
    Ski, bike and wish I was gay.

  3. #3
    Senior Member YATES's Avatar
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    uh oh.. i just bid on a 34.9 mm and my seat tube is 31.9.. is this a problem?

  4. #4
    Pwnerer Wordbiker's Avatar
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    Yup, but better than the other way around. You can shim it smaller, not larger.
    Quote Originally Posted by ahsposo View Post
    Ski, bike and wish I was gay.

  5. #5
    Senior Member YATES's Avatar
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    hm, well hopefully i'll get outbid on ebay :/

  6. #6
    Senior Member Tapeworm21's Avatar
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    I'd assume a LBS will have the shims. Don't worry about it.

  7. #7
    Pwnerer Wordbiker's Avatar
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    Maybe an auction will come up for the shims.
    Quote Originally Posted by ahsposo View Post
    Ski, bike and wish I was gay.

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