XLE rear derailleurs are compatible with 10 and 11-speed mountain shifters. Increased chain stability and wide range parallelogram design let you power through any terrain with a wide selection of gear-ratios. Compatible with wide range cassettes. Strong spring tension for enhanced chain stability. Compatible with 10 and 11-speed mountain systems. Long cage for single 42T setup. Compatible with double 42T. Compatible with triple 40T. Item Specifications: Rear Derailleur Mount Type: 10x1 Standard, Drivetrain Speeds: 10, Cage Length: Long, Chain Wrap Capacity (teeth): 47teeth, Largest Cog: 42, Color: Black, Weight: 281g, Rear Der/Shifter Compatibility: DynaSys,