This is Shimano ZEE RD-M640 Rear Derailleur.
- Shadow Plus technology proven to reduce chain slap, drop and impact noise and the 10-speed short cage rear derailleur's low-profile tucks safely below the cassette cogs
- Free-Ride specific designed for use with wide-range cassettes (up to 36t max cog)
Drivetrain Speeds: 10
Cage Length: Short
Largest Cog: 36
Rear Der/Shifter Compatibility: Shimano Mountain