The all-new SHIMANO DEORE M6100 rear derailleurs deliver advanced shifting performance with decreased tension in the low gear position. Larger 13T pulleys increase efficiency and chain management while compatibility with SHIMANO's new 12-speed cassettes boosts range. FEATURES: SHIMANO SHADOW RD+: Less distraction quiet drive train Rear derailleur stabilizer reduces chain slap. Simple solution for chain drop. Lighter and more efficient than roller type chain device SPECS: Cage Length: SGS / Long Total Capacity: 41T Max Front Difference: 0T Color: Series Color Mount: Direct attachment (conventional) Number of Pulley Teeth: 13 Series: Deore Generation: M6100 Max Low Sprocket: 51T Min Low Sprocket: 51T Rear Speeds: 12 Top Normal Spring Type: Shimano Shadow RD+