The SRAM XX1/X01/GX Eagle Rear Derailleur Jockey Wheel kit is composed of a 12-teeth upper wheel and a 14-teeth lower wheel with X-Sync profile. It's compatible with SRAM 12 speed XX1 Eagle, X01 Eagle, and AXS rear derailleurs.

Note: Jockey wheels must be installed in correct positions: lower wheel is larger than the upper wheel.