Hydra Classic Boost 6B Rear Hub Hydration and the streamlined fit layers

and the streamlined fit layers easily under a shell

Also compatible with other indoor trainer apps by removing the Zwift Cog and replacing with cassette of choice

recycled materials

Its steel construction and SRAM's PowerGlide technology combine to deliver miles of solid shifting and outstanding durability

Hydra Classic Boost 6B Rear Hub Hydration and the streamlined fit layersIndustry Nine Classic hubs are the heart of your wheelset, everything revolves around them, literally. Every Classic mountain hub is made start to finish in our Asheville, NC machine shop. From turning and milling bar stock 7075 T6 aluminum for shells, axles and encaps, wire EDM cutting A2 tool steel for pawls and driverings, to our own in house anodization lab, every step of design, engineering, manufacturing and assembly is done on premises to our