Rear

Centos delivers race-level shifting performance with full-aluminum construction. These derailleurs support all riders engaged in any kind of road riding. - Lightweight full aluminum construction - Short cage is compatible with double cranksets and a 30T max cassette

M21 rear derailleurs are designed to work with 6- and 7-speed Shimano road and mountain shifters. Enjoy the wide variety of bikes you can get going again with M21 rear derailleurs. - Robust composite and steel construction - Compatible with Shimano 6- and 7-speed mountain and road systems - Long cage for double or triple cranksets and 32T max cassette cog - Includes frame hanger attachment for use with older frame designs

R-series rear derailleurs are designed to work with 7, 8, 9, and 10-speed Shimano-compatible road shifters. These R10 aluminum rear derailleurs are lightweight, precision CNC-machined, robust, and can get any bike back on the road. - Lightweight all-aluminum construction - Compatible with Shimano 7, 8, 9, and 10-speed road systems - Not compatible with Shimano Tiagra 4700 road system - Short cage for double crankset and 28T max cog - Medium cage for double crankset and 34T max cog

R-series rear derailleurs are designed to work with 8 and 9-speed Shimano-compatible road shifters. These R8 rear derailleurs have composite and steel parts that weigh more but have the same durability and performance as R9 and R10 derailleurs. - Steel pulley cage for extra durability - Not compatible with Shimano Tiagra 4700 road system - Short cage for double crankset and 28T max cog - Long cage for triple crankset and 28T max cog

XCD rear derailleurs are compatible with Shimano mountain shifters and wide-range cassettes. CNC-machined rigid construction partnered with enhanced chain stability allows you to power up and down through a variety of terrains. - Compatible with wide-range cassettes - Strong spring tension for enhanced chain stability - Clutch mechanism can be turned on to maintain chain tension or off to allow for easier shifting and easier wheel swaps - Full aluminum lightweight construction - Medium cage compatible with Shimano 11-speed mountain systems and fits 1x setups with cassette cogs up to 46T - Long cage compatible with Shimano 10-speed mountain systems and fits 1x/2x/3x setups with cassette cogs up to 42T