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  1. #1
    Junior Member andrewchng's Avatar
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    Front D 28.6mm 31.8mm and 34.9mm

    Hi, I wish to know how are these numbers derived?

  2. #2
    Curmudgeon Wil Davis's Avatar
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    The numbers refer to the diameter (in mm) of the seat tube to which the clamp is attached. Is that the information you were looking for?

    - Wil

  3. #3
    Senior Member Nubie's Avatar
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    Check the spec sheet for your bike, if you have it. If not, do what I did - take a piece of string and wrap it around your seat tube to find out the circumference (in mm). Divide the circumference by 3.14. Voila!

    Cirumference = 2 x r x pi = diameter x pi

    (And yes, I am a big dork)

  4. #4
    Junior Member andrewchng's Avatar
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    yes it is. thanks alot.. now i know...

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