microSHIFT M21 Rear Derailleur - 6,7 Speed, Super Short Cage, Black bmx HDPE or ABS shell lined

HDPE or ABS shell lined with EPS and outfitted with compression molded pads

Intelligent memory circuit remembers the last used brightness level and mode when turned on again

Rinses residue-free with water

All KMC chains include either a missing link or replacement pins

Recharges in 2 hours with included USB cable1

microSHIFT M21 Rear Derailleur - 6,7 Speed, Super Short Cage, Black bmx HDPE or ABS shell linedM21 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