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  • Shimano RD-M8120 Deore XT SGS 12-Speed Rear Derailleur

Shimano RD-M8120 Deore XT SGS 12-Speed Rear Derailleur

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Designed for 2x 12 drivetrain or 1x with 45T cassette. 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.

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Larger 13T pulleys increase efficiency and chain management while compatibility with SHIMANO's new 12-speed cassettes boosts range.


  • Fast and precise shifting performance optimized to take on any trail
  • Faster and shockless shifting
  • Extra wide range with front double 36-26T & close step 12-speed drivetrain with low sprocket combination -10-45T
  • 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


Model No. RD-M8120-SGS
Series DEORE XT M8100 Series
Color Series color
Average weight 287 g
Compatible chain HG 12-speed
Total capacity 45T
B-axle is Hollow  Yes
Direct Mount attachment (Conventional) Yes
Fluoric coated link bushings 7
Low sprocket Max. 45T
Low sprocket Min. 45T
Max. front difference 10T
G pulley bearing Sealed Bearing
Sunken type pulley bolt Yes
Pulley Teeth 13T
T pulley bearing Sealed Bearing
Pulley cage SGS
Top-normal spring type is SHIMANO SHADOW RD+ Yes
Top sprocket Max. 10T
Top sprocket Min. 10T
Rear speeds 12 (Front double)
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