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Old 06-24-07, 09:51 PM   #1
YATES
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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?
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Old 06-24-07, 10:10 PM   #2
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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.
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Old 06-24-07, 10:12 PM   #3
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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?
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Old 06-24-07, 10:18 PM   #4
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Yup, but better than the other way around. You can shim it smaller, not larger.
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Old 06-24-07, 10:19 PM   #5
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hm, well hopefully i'll get outbid on ebay :/
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Old 06-24-07, 10:26 PM   #6
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I'd assume a LBS will have the shims. Don't worry about it.
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Old 06-24-07, 10:28 PM   #7
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Maybe an auction will come up for the shims.
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