- SRAM XD compatible with cassette adapter included
- SRAM XDR compatible without spacer
- Works with Hammer, H2 and H3 trainers
- 12-speed systems cannot be used with the H3 Direct Drive Smart Trainer, as well as the CycleOps Hammer and H2.
Direct Drive XD/XDR Freehub
XD driver that works with Saris H3, and CycleOps Hammer & H2 trainers.