e*thirteen Race Alloy Rear Hub 32 Hole 150 / 157 x 12mm with 7 speed Integrated Cassette Black Race Alloy Hubs deliver low drag, high reliability, and excellent sealing from the elements. They're meticulously optimized for strength-to-weight ratio, meaning exceptional gravity durability without a hefty weight penalty. Flange angles and spoke hole designs have been improved for precise spoke/nipple alignment, reduced spoke hole stress, and increased wheel longevity