Shimano xt m8050 di2 11sp rear derailleurthe shimano xt di2 m8050 11 speed rear mech is designed specifically to work with a shimano electronic di2 drivetrain, the m8050 uses a medium cage that can allow you to run up to a 46t cassette.the low profile geometry and chain stabiliser ensure drivetrain security while the electronic wire transmission maintains consistent performance in all weather and trail conditions.featuresshifting motor responds instantly to rider inpute tube electric wire transmission guarantees consistent performance in all conditionsaccurate chain position in every gearprogrammable, multi shift and shimano synchronised shift functionslow profile design keeps derailleur safely away from trail obstaclesshimano shadow rd chain stabilizer with easy adjustmentcompatible with cs m8000 11 46t cassette 1x11 and 11 40 11 42 2x11weight 329gbuy shimano components from chain reaction cycles, the world's largest online bike store.