The all-new DEORE XT RD-M8150 speed rear derailleur combines race-proven quality with Shimano original technologies to help keep you flowing and focused on the right line. The new E-MTB optimized design allows full integration with SHIMANO E-Bike Systems and HYPERGLIDE+ drivetrains to unlock entirely new functionality. This system integration allows innovative features like FREE SHIFT. It's a simpler, more pure E-MTB experience only possible through the fusion of drivetrain engineering, e-bike system components, and electronic shifting intelligence.Wide range: 10-51TFast and precise shifting performance optimized to take on any trailHYPERGLIDE+ technologyFREE SHIFT allows you to select the optimal gear while coasting into switchbacks or dynamic terrain changes, so you're always ready to charge with better balance and controlQuick and smooth shifting under the heavier chain loads of e-bikesPower directly supplied from main STEPS batteryCustomize and run diagnostics with E-TUBE PROJECTLow-profile design offers uninterrupted rear shifting on rough terrainConnect directly to STEPS via E-TUBE cable EW-SD300 Shimano Deore XT RD-M8150 Di2 rear Derailleur Rear Derailleur UPC: 192790239613