Speedplay and Sidi, together at last. This Sidi Genius 6.6 sports the all-new carbon fiber Speedplay-specific sole. The sole is Speedplay-approved, and will save you nearly a quarter-pound, and three millimeters of stack height compared to using adapters. As if that wasn't enough reason to celebrate, Sidi has also redesigned the heel retention system to provide a more comfortable, adjustable, and secure fit.
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