Shimano ZEE RD-M640-SS Rear Derailleur - 10 Speed Short Cage Gray With
Shimano ZEE RD-M640-SS Rear Derailleur - 10 Speed Short Cage Gray With, Shimano ZEE RD-M640 Rear DerailleursShimano's stabalizing Shadow RD+ clutch technology is proven to reduce chain slap and noiseFR spec designed for use with wide-range cassettes; up to 36t max cog