RED eTap Rear Derailleur - SRAM RED eTap Rear Derailleur - 11-Speed, Short Cage,
SRAM RED eTap Rear Derailleur - 11-Speed, Short Cage, Black, A2. The SRAM RED eTap rear derailleur wirelessly executes shifts the instant you demand. It's easy to set up, clean in appearance and delightfully uncomplicated.