Searching...
sign in
This product has been discontinued, but we can help!
Show All Products From MicroShift
Show Rear Derailleurs From MicroShift
Possible replacements for the
M21 Rear Derailleur - 6,7 Speed, Short Cage, Black
M21 Rear Derailleur - 6,7 Speed, Short Cage, Black
MicroShift
Sword Rear Derailleur - 10-Speed Long Cage Compatible with Sword 2x
original price: $7999
online price: $6999
MicroShift
Sword Rear Derailleur - 10-Speed Medium Cage Compatible with Sword 1x
original price: $7999
online price: $6899
MicroShift
ADVENT X V2 Rear Derailleur - 10-Speed Medium Cage Clutch ADVENT X and Sword Compatible
original price: $7699
online price: $6599
MicroShift
Advent MX Pro Rear Derailleur - 10/11-Speed, Clutched, Repairable Aluminum Medium Cage, 50t Max
original price: $7699
online price: $6299
MicroShift
ADVENT RD-M6195M-B Rear Derailleur - 9 Speed Medium Cage With Clutch
original price: $6499
online price: $5699
MicroShift
ADVENT Super Short Rear Derailleur - 9 Speed - Short Cage - Black - With Clutch
original price: $6499
online price: $5699
MicroShift
Advent MX Rear Derailleur - 10/11-Speed, Steel Medium Cage, 50t Max
original price: $5999
online price: $5199
MicroShift
Sword Black Medium Cage Rear Derailleur - 9-Speed, Compatible with Sword Black 1x
original price: $4299
online price: $4099
MicroShift
R9 Rear Derailleur, 9-Speed, Medium Cage, 34T Max, Shimano Compatible
online price: $3999
MicroShift
Acolyte Super Short Rear Derailleur - 8 Speed - Short Cage - Black - With SpringLock
original price: $3999
online price: $3499
MicroShift
MarvoLT M46 Rear Derailleur, 7/8/9-Speed, Long Cage, Shimano Compatible
original price: $3199
online price: $2999
MicroShift
Estes 2x Rear Derailleur - 7/8/9-Speed, 34-40t Max Cog
online price: $2099
---- Archived Product Data ----
MicroShiftM21 Rear Derailleur - 6,7 Speed, Short Cage, Black
We're sorry, this product has been discontinued.
Show Products From MicroShift
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.
- Compatible with Shimano 6- and 7-speed mountain and road systems
- Robust composite and steel construction
Specifications & Identifiers
Cage Length
Short
Chain Wrap Capacity
39t
Color
Black
Derailleur Mount Style
10x1 Standard
Largest Cog
34t
Rear Shifter Compatibility
Shimano Mountain
Speeds
6-Speed, 7-Speed
UPC
657993356869
MPN
RD-M21S
Tree Fort ID:
333222458703
Have Experience With This?
Sales and Deals 
Chat Now