Shimano Rd-M8100 Rear Derailleur Xt Shadow + 12-Speed Medium 45T Maximum

Features
For 1x system
Fast and precise shifting performance optimized to take on any trail
Silent drivetrain in all gear positions
Stable drivetrain on rough terrain
Faster and shockless shifting
Low-profile design
Wide range 12-speed drivetrain
Decreased rear derailleur and chain tension in low gear
New bumper added to rear derailleur pulley cage

Specifications
Bigger 13T pulley
Compatible Chain: HG 12-speed
Low Sprocket Max: choose; 45t (medium cage), 51t (long cage)
Low Sprocket Min: 45t
Max Front Difference: 0t
Cage Length: choose; GS Medium Cage, or SGS Long Cage
Rear Speeds: 12
Top Sprocket Max: 10t
Top Sprocket Min: 10t
Total Capacity: 35t (medium cage), 41t (long cage)

Mfr Claimed Weight
TBC