About Shimano XT RD-M8100 Shadow+ Long Cage 12 Speed Rear Derailleur
The all-new SHIMANO DEORE XT M8100 series of derailleurs brings a new level of drivetrain silence thank to decreased tension in the low gear position and an added bumper on the pulley cage. Larger 13T pulleys increase efficiency and chain management while compatibility with SHIMANO's new 12-speed cassettes boosts range.

Features
Fast and precise shifting performance optimized to take on any trail

Faster and shockless shifting

HYPERGLIDE+

Wide range 12-speed drivetrain with low sprocket combination -10-51T

Silent drivetrain in all gear positions

Decreased rear derailleur and chain tension in low gear

New bumper added to rear derailleur pulley cage

Bump Stopper

Bigger 13T pulley

Stable drivetrain on rough terrain

Low-profile design

SHIMANO SHADOW RD+

Specifications
Model No: RD-M8100-SGS

Series: DEORE XT M8100 Series

Average Weight: 284g

Remarks: w/ Bumper on pully cage

Compatible Chain: HG 12-speed

Total Capacity: 41T

B-Axle Hollow Axle: Yes

Mount Direct Attachment (Conventional): Yes

Fluoric Coated Link Bushings: 7

Low Sprocket Max: 51T

Low Sprocket Min: 51T

Max. Front Difference: 0T

Pully G Pulley bearing: Sealed Bearing

Pulley Sunken Type Pulley Bolt: Yes

Pulley Teeth: 13T

Pulley T Pulley Bearing: Sealed Bearing

Pulley Cage: SGS

Top Normal Spring Type SHIMANO SHADOW RD+: Yes

Top Sprocket Max: 10T

Top Sprocket Min: 10T

Rear speeds: 12

About Shimano
Shimano is a Japanese multinational manufacturer founded in 1921 by Shozaburo Shimano. They are well known as the largest bicycle component manufacturer in the world with their main manufacturing plants in Kunshan, China; Malaysia; and Singapore. Along with cycling components they also produce fishing tackle, and rowing equipment.