XLE rear derailleurs are compatible with Shimano 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. Features: Compatible with wide range cassettes Strong spring tension for enhanced chain stability Compatible with Shimano 10 and 11-speed mountain systems Long cage for single 42T setup Compatible with double 42T Compatible with triple 40T Specs: Rear Derailleur Mount Type10x1 Standard Drivetrain Speeds10 Cage LengthLong Largest Cog42 ColorBlack Rear Der/Shifter CompatibilityShimano DynaSys