Shimano RD-M8150-12 Deore XT Di2 12-Speed Rear Derailleur The future of shifting With its e-MTB optimized design paired with the legendary performance of Shimano's XT series, the Shimano RD-M8150 Deore XT Di2 Rear Derailleur is at the heart of the XT shifting ecosystem. Like the mechanical and non-e-bike versions, this XT derailleur uses Hyperglide+ technology for smoother and more precise shifts, and Shadow RD+ technology for reliable shifting over the roughest terrain. This e-optimized XT derailleur connects directly to a Shimano STEPS system via an E-Tube cable, for stable and reliable power, while the revolutionary Free Shift system allows riders to change gears when emerging from a descent without pedaling. For advanced performance, features, and legendary reliability, the Shimano RD-M8150 is hard to beat. Featurese-MTB optimized for seamless integration with Shimano STEPS, uninterrupted power, and unbeatable features Shadow RD+ technology provides reliable shifting over rough terrain Hyperglide+ for smoother, faster, quieter shifting FREE SHIFT allows riders to shift into the optimal gear while coasting after a climb, putting riders into the right gear for every situation SPECIFICATIONSChain Capacity41-tooth Low Sprocket Max51-tooth Speeds12Chain Compatibility HG 12-speed Drivetrain Compatibility1x12Average Weight375 grams | Shimano | Deore Xt Rd-M8150-12 12 Speed Rear Deraileur Rear Derailleur, Rd-M8150-12, Deore Xt, Sgs 12-Speed, Top No