Tight and precise. Designed to withstand full force pedalling on the roughest trails, while shifting gears as smooth as ever. Shimano’s best chain stability yet.

Features
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

Specifications
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)

Mfr Claimed Weight
237g