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Giro finale
Photo ©: Bettini


Quick Spins, December 19, 2007

Challenge's Grifo line of 'cross tires
Photo ©: James Huang
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The Grifo comes equipped
Photo ©: James Huang
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Challenge offers both tubulars and open tubulars…
Photo ©: James Huang
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…as well as two 'cross-specific tread patterns.
Photo ©: James Huang
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The faster rolling Grifo XS
Photo ©: James Huang
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