Specialized DT Swiss Ratchet EXP Freehub Body for Roval wheels with DT Swiss 180 hubs. Designed for SRAM XDR road cassettes. DT Swiss manufacturer part number is HWYABL00S5401S. OEM Part on the following bikes: S-Works Tarmac SL8 S-Works Roubaix S-Works Aethos S-Works Diverge S-Works Tarmac SL7 Compatible with the following wheels: Terra CLX II (DT Swiss 180 Hubs) Alpinist CLX II Rapide CLX II Alpinist CLX Rapide CLX Terra CLX