The SRAM Rival 22 Rear Derailleur is an 11-speed road derailleur that works with standard or compact 11-speed road cranks. It uses SRAM Exact Actuation, a 1:1 cable pull ratio that makes set-up easy and keeps shifts fast and accurate.A magnesium inner link and an aluminum inner and outer cage keep weight down, while stainless steel parallelogram hardware adds durability, and Aeroglide pulleys run the chain smoothly. It is offered with a short cage, or with the medium WiFli cage for larger cassettes up to a 32-tooth cog.