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Old 07-29-09, 09:16 AM
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Pig_Chaser
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It's the tire that makes the difference to the outside diameter of your wheel, so leave the 23C.

For the ultimate in accuracy though, try measureing the OD of your wheel. Line up the stem on the ground, mark it, roll it till the stem is in the same place and measure the distance. Usually computers want the distance in cm or mm.
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