evo.com | Industry Nine Hubs > The Industry Nine Hydra Classic ISO CL Boost Rear Hub turns heads with its distinctive near-700-clicks-per-revolution sound that announces your presence on every trail. That signature buzz comes from revolutionary 0.52deg engagement that provides virtually instant power transfer when you need it most on technical climbs or quick accelerations. Machined from 7075-T6 aluminum, these hubs combine bomber durability with surprisingly low weight, while the intuitive design lets you service them without proprietary tools. This model is for use with SRAM XD cassettes. Bzzzzzzzzz. 7075-T6 Aluminum Alloy 12 x 148mm Boost Spacing 0.52deg Engagement A2 Tool Steel Pawls and Driverings 6 Bolt Rotor Compatible | Industry Nine Hydra Classic ISO CL Boost Rear Hub 2023 - 12x148 / 32Hole in Green | Aluminum