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Zipp Part 2: The drum tests loads wheels with 142 pounds and spins them over bumps at 25 mph for at least 40 hours.

Zipp Part 2: The drum tests loads wheels with 142 pounds and spins them over bumps at 25 mph for at least 40 hours.  |  Photo: Zack Vestal
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Zipp Part 2: The drum tests loads wheels with 142 pounds and spins them over bumps at 25 mph for at least 40 hours.
Zipp Part 2: The drum tests loads wheels with 142 pounds and spins them over bumps at 25 mph for at least 40 hours.  |  Photo: Zack Vestal
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