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Use your SRAM XD and XDR-equipped bike on your Hammer trainers with this Saris XD/XDR Freehub Body. It's a simple swap'n'pedal situation.
Freehub Body
For Use with SRAM RED and Force eTap AXS™ 12 Speed Groups on Saris Direct Drive Trainers
Works with Hammer, H2 and H3 Trainers
Compatible with SRAM XDR and XD Cassettes – Spacer included for XD, XDR requires no spacer.