Genuine Spare Cervelo Replacement gear hanger . Supplied without nut . Compatible Cervelo Bikes: S5, S3, R5, R3, P5 and Aspero. Compatible Shimano Derailleurs: R9200/R8100/R7100/R9100/R8000/R7000.
Best Price: £19.99 from Merlin Cycles
Cervelo Direct Mount Derailleur Hanger For 12mm Axles – Black Reviews