Shimano Deore XT RD-M780/M770 Series Rear Derailleurs FEATURES : Low profile design and single tension construction keeps the derailleur body from contacting the chainstay Stronger return spring for more crisp shifting feeling Direct routing reduces the risk of snagging Shimano Shadow RD+ clutch technology helps maintain chain stability and provides a quieter riding experience Optimized with Shimano's DYNA-SYS technology to provide seamless shifting transitions SPECS : Color: Black Largest Cog: 36 Rear Derailleur Mount Type: 10x1 Standard , Shimano Rear Direct Mount Chain Wrap Capacity (teeth): 43 Cage Length: Long Rear Der/Shifter Compatibility: Shimano Mountain Drivetrain Speeds: 10 Weight: 266