The most robust Deore XT 12-speed mechanical rear derailleur to date promises a reliable, robust ride for every discipline. It&';s based around a modern hanger and a new low-profile, wedge-shaped design to avoid impacts on the trail. If it does hit rocks or roots, a spring inside the derailleur helps it absorb impact and return to its original position. With a 510% gear range, the RD-M8200 derailleur is suitable for every ride, be it an enduro race or all-day adventure. Designed for use with 10-51t cassettes for a wider gear range (cassette sold separately) Shadow ES design provides a slimmer, stronger evolution of Shimano s pioneering chain-stabilizing Shadow concept Wedge-Shaped Design is made to move out of the way to absorb trail impacts for a worry-free ride Solid pulley and shielded pulley teeth prevent trail debris from jamming up your flow 13t pulley wheels feature sealed bearings to provide smooth movement Item Specifications Cage Length Long Chain Wrap Capacity (teeth) 41 Color Black Drivetrain Speeds 12 Largest Cog 51 Rear Der/Shifter Compatibility Shimano Mountain Rear Derailleur Mount Type Shimano Rear Direct Mount Weight 367 Shimano Deore XT RD-M8200 Rear Derailleur Rear Derailleur UPC: 192790319827