Details

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

Part Numbers

Option	UPC	MPN	Store SKU
Short Cage / Black / 6 – 7-speed	04710495436388	RD-M21SS	MIC48633423K
Long Cage / Black / 6 – 7-speed	04710495436340	RD-M21L	MIC47624793K