microSHIFT M21 Rear Derailleur - 67 Speed Super Short Cage Dropout Claw Hanger BLK

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