Description Tight and precise. Designed to withstand full-force pedaling on the roughest trails, while shifting gears as smoothly as ever. Shimano’s best chain stability yet SPECS: Shadow RD for optimal chain retention Decreased rear derailleur tension at low gear position, to prevent high chain tension Added bumper at rear derailleur pulley cage Optimized for new drive system Cage Length: choose; GS/Medium, or SGS/Long Total Capacity: 35T (medium cage), 41T (long cage) Max Front Difference: 0 Teeth (made for 1×12 systems) Mount: Direct attachment (conventional) Tension Pulley Bearing: Sealed Bearing Guide Pulley Bearing: Sealed Bearing Number of Pulley Teeth: 13T Series: M9100 Max Low Sprocket: 45T (medium cage), 51T (long cage) Min Low Sprocket: 45T Top Normal Spring Type: Shimano SHADOW RD Rear Speeds: 12-speed (also compatible with Shimano CS-M9110 11-speed cassette) Weight: 237g.
