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  1. #1
    Senior Member rideintexas's Avatar
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    wheels 700c vs. 27"

    what is the difference between 700c and 27". Can frames built for 27" wheels fit 700c wheels? What does 700c mean exactly?
    Thanks

  2. #2
    I drink your MILKSHAKE Raiyn's Avatar
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  3. #3
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    Quote Originally Posted by Gonzo Bob
    A 700C has a 622mm bead diameter and a 27" has a 630mm bead diameter.
    A 27" frame can definately take the smaller 700cs, going up to 27" on a 700c frame would depend on the frame (close-clearance racing frames - probably not; relaxed touring/hybrid frames - possibly). But why would you want to? I'm assuming you want to put 700cs on a 27" frame?

    I think 700c refers to the nominal tyre diameter of 700mm (650c has 650mm tyre diameter). I'm not sure what the letter refers to (there's also 700b).

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    Quote Originally Posted by Jonny B
    A 27" frame can definately take the smaller 700cs, going up to 27" on a 700c frame would depend on the frame (close-clearance racing frames - probably not; relaxed touring/hybrid frames - possibly). But why would you want to? I'm assuming you want to put 700cs on a 27" frame?

    I think 700c refers to the nominal tyre diameter of 700mm (650c has 650mm tyre diameter). I'm not sure what the letter refers to (there's also 700b).
    Sheck the above link.Sheldon has the lowdown on tire and rim sizing.

  5. #5
    cycles per second Gonzo Bob's Avatar
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    Quote Originally Posted by rideintexas
    Can frames built for 27" wheels fit 700c wheels?
    Maybe. A 700C wheel will certainly fit in a frame designed for 27" wheels since it is a little smaller (4mm smaller radius). But there could be an issue getting to brakes work as it might not be possible to lower the brake pads enough to contact the rim. For caliper brakes, a solution to this would be drop bolts. For cantilever or v-brake, the solution would be to have a frame builder lower the posts.

  6. #6
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    Quote Originally Posted by Gonzo Bob
    Maybe. A 700C wheel will certainly fit in a frame designed for 27" wheels since it is a little smaller (4mm smaller radius). But there could be an issue getting to brakes work as it might not be possible to lower the brake pads enough to contact the rim. For caliper brakes, a solution to this would be drop bolts. For cantilever or v-brake, the solution would be to have a frame builder lower the posts.
    The difference is about 4mm. Many brakes have enough reach. Longer reach calipers are also available.

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