Direct Drive Shimano/SRAM Trainer Freehub

Product Features

• Compatible with the Saris H3 Direct Drive Smart Trainer, as well as the CycleOps Hammer and H2.
• Hyperglide freehub is compatible with Shimano and SRAM 11-speed systems.
• 12-speed systems cannot be used with the H3 Direct Drive Smart Trainer, as well as the CycleOps Hammer and H2.