The Shimano Deore XT RD-M8100/M8120 rear derailleur is designed to provide smooth and stable shifting for 12-speed MTB drivetrains. * Offers fast and shockless shifting * The low-profile design includes a bumper added to the derailleur pulley cage * Shimano Shadow RD+ technology reduces chain slap and creates a quieter drivetrain * Includes large 13t pulley * Long cage is designed to be used with 2x12 drivetrain systems

12-speed rear. Decreased tension in low gear and added bumper improve drivetrain silence. Large 13T pulleys increase efficiency. Fast, shockless shifting and low-profile design.

Auto Part Position: Rear. Item Weight: 413 Grams. Material: Aluminum. Color: Black/Gray. Brand: SHIMANO. Date First Available: July 20, 2019. Best Sellers Rank: #48,047 in Sports & Outdoors. Customer Reviews: 4.7 out of 5 stars 259 ratings 4.7 out of 5 stars. : B07SWQZB46. Sport Type: ?Cycling. Size: ?1x12. Included Components: ?Rear Derailleur. Model Year: ?2019. Part Number: ?587830. Manufacturer: ?Shimano. Number of Items: ?1. Suggested Users: ?unisex-adult. Material: ?Aluminum. Color: ?Black/Gray. Model Name: ?587830. Warranty Description: ?90 Day Limited. Brand Name: ?SHIMANO. Item Weight: ?413 Grams. Item Dimensions LxWxH: ?7 x 7 x 5 inches. Package Weight: ?0.46 Kilograms. Item Package Dimensions L x W x H: ?6.1 x 6.1 x 4.1 inches.