- 10
- 7, 6
- 21T
- 28-30T
Specifications
As listed in the manufacturer's catalog.
General
- Speed
- 7-Speed, 6-Speed
- Cage Length
- Super Short Cage
- Max Cog
- 28-30T
- Min Cog
- 13-14T
- Capacity
- 21T
- Clutch
- No
- Cage Material
- Steel
- Outer Link Material
- Composite
- Compatibility
- Shimano Mountain
How spec sheets write it
The most common ways bicycle spec sheets name it, by number of mentions.
-
Microshift RD-M21SS / SSA - 6 Speed
-
MICROSHIFT, RD-M21SS, 7speed
-
BTWIN RD-M21SS derailleur
-
BTWIN RD-M21SS derailleur with dropout protection
-
Shimano Tourney OR microSHIFT RD-M21SS
Bicycles
Published bicycles that use it, newest model years first.
