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Old 01-12-04, 11:22 AM
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Gonzo Bob
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Join Date: Oct 2003
Location: Minnesota
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Bikes: Early 1980's Ishiwata 022 steel sport/touring, 1986 Vitus 979, 1988 DiamondBack Apex, 1997 Softride PowerWing 700, 2001 Trek OCLV 110

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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.
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