CERVELO fit rear mech/derailleur CNC hanger by raceTi fits many models including R2, R3, R3 Team, R5, R5 CA, R5 VWD, RCA, S2, S3, S5, S5 Team, S5 VWD - see description for full list. Cervelo CNC hanger cut from 6061 billet alloy, complete with stainless steel screws.