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  1. #1
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    Mavic GP4: 700c or 27"?

    What size are these rims? Everywhere I've seen them mentioned says thay are 700c, except the DT Swiss spoke calculator, which says they are 27". How much of a difference is there between the two anyway?

  2. #2
    Senior Member gazedrop's Avatar
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    Looks like you stumped us with this one!

  3. #3
    cycles per second Gonzo Bob's Avatar
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    GP4 is tubular and therefore "700C". A 700C clincher has a 622mm bead diameter and a 27" clincher has a 630mm bead diameter.

  4. #4
    Not-so-Senior Member
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    Thanks Bob

  5. #5
    Senior Member miamijim's Avatar
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    Its funny how rim sizing works. Although they have different diameters you still see rims listed as if they were the same.

    The gear chart I have says 700/27"......
    WWW.CYCLESPEUGEOT.COM 2005 Pinarello Dogma; 1991 Paramount PDG 70 Mtb; 1976? AD Vent Noir; 1989 LeMond Maillot Juane F&F; 1993? Basso GAP F&F; 1989 Terry Symmetry; 2003 Trek 4700 Mtb; 1983 Vitus 979

  6. #6
    Member Seaners's Avatar
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    Quote Originally Posted by miamijim
    Its funny how rim sizing works. Although they have different diameters you still see rims listed as if they were the same.

    The gear chart I have says 700/27"......
    But doesn't it depend on the size of your tyre as well? If you're going to be exact about it... Best thing to do would be to try and measure your wheel with inflate tyre to get actual wheel diameter., but if it's all relative just stick with the charts.

  7. #7
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    Quote Originally Posted by Seaners
    But doesn't it depend on the size of your tyre as well? If you're going to be exact about it... Best thing to do would be to try and measure your wheel with inflate tyre to get actual wheel diameter., but if it's all relative just stick with the charts.
    when building wheels, the tire diameter doesn't matter one bit. I'm guessing that is waht the original poster is doing, since he was looking on the dt spoke calculator...

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