This is a replacement Tacx freehub body for direct drive trainers. The standard body of a Tacx direct drive trainer is not compatible with all cassettes. Use this body to suit your SRAM XD-R cassette. It's easy to place, and all you need is a 5mm hex key.
For year-round training and a fully interactive indoor cycling experience, the Tacx Flow Smart trainer offers everything you need. Its wheel-on design allows for easy setup and storage. It even connects to your favorite apps, such as Zwift, Tacx and Train
