SHIMANO DEORE XT is the original mountain bike groupset trusted by generations of mountain bikers around the world. Whatever the trail, whatever you ride,
XT is your solution for mountain biking today. Reliable shifting. Superior braking.
Intuitive maintenance. XT is the high performance workhorse you can count on.

Features:

• Faster and shockless shifting
• Low-profile design
• Extra wide range with front double 36-26T & close step 12-speed drivetrain with low sprocket combination -10-45T
• Decreased rear derailleur and chain tension in low gear
• New bumper added to rear derailleur pulley cage
• Bigger 13T pulley
• Fast and precise shifting performance optimized to take on any trail
• Silent drivetrain in all gear positions
• Stable drivetrain on rough terrain

Specifications:

• Model Number: RD-M8120-SGS
• Series: SHIMANO_DEORE_XT_M8100
• B-Axle: Hollow axle
• Compatible chain: HG 12-speed
• Direct attachment (Conventional)
• Fluoric coated link bushings: 4
• Low sprocket Max.: 45T
• Low sprocket Min.: 45T
• Max. front difference: 10T
• Pulley G pulley bearing: Sealed Bearing
• Pulley Sunken type: pulley bolt 
• Pulley Teeth: 13T
• Pulley T pulley bearing: Sealed Bearing
• Pulley cage: SGS
• Rear speeds: 12, (Front double)
• Top-Normal Spring Type: SHIMANO SHADOW RD+
• Top sprocket Max.: 10T
• Top sprocket Min.: 10T
• Total capacity: 45T