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Shimano Deore XT RD-M8120 12-Speed Shadow+ Rear Derailleur

£87.54 RRP £109.99
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Mech OptionSGS Long Cage

Shimano is a Japanese multinational corporation synonymous with cycling. Constituting 50% of sales in the global cycling market, and with their parts spanning across all types of bicycle, it is a highly reputable business that is constantly developing and innovating its assets.

Shimano Deore XT RD-M8120 12-Speed Shadow+ Rear Derailleur

XT Shadow plus 12-speed double rear derailleur for the ultimate in shifting performance and durability.

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 13 Tooth pulleys increase efficiency and chain management while compatibility with Shimano's new 12-speed cassettes boosts range.



Hyperglide+ drivetrain’s redesigned cassette and chain promotes the next generation of MTB riding by enhancing speed, shifting efficiency and smoothness over any terrain.

Benefits and features:

  • Better chain engagement, stronger retention, and smoother pedaling provide greater power and confidence over rapidly changing terrain
  • Definitive up & down shifting in both directions boosts riders’ concentration and acceleration
  • Ultra-efficient drivetrain with smoother power transmission increases comfort and reduces rider stress
  • A wide range of gearing choices, cassette options and the choice of a single or double front chainring, support a wide variety of MTB riding styles, abilities and preferences

Hyperglide+ will help kickstart the next generation of mountain bike riding by introducing continuous pedaling over virtually any terrain. This revamped drive system and dedicated chain deliver fast shifting, efficient power transfer and chain stability like you’ve never experienced before.

It helps riders adapt to drastically changing trail conditions by precisely judging the optimal shifting moment for consistently smooth operation.

Hyperglide+ helps riders seamlessly maneuver rough trails by reducing pedaling shock and cutting shifting times by a 1/3. (vs. current HG system)

Shimano Shadow RD+

  • Less distraction quiet drive train
  • Rear derailleur stabilizer reduces chain slap
  • Simple solution for chain drop
  • Lighter and more efficient than roller type chain device


  • Shadow plus features a super low profile design and optimized slant angle for super light shifting action
  • Shadow Plus uses a chain stabilising switch that when on will reduce chain bounce in rough terrain maintaining more stable drive and shifting
  • Single tension spring prevents contact with the chainstay resulting in a silent ride
  • Rubber bumper on pulley cage for added silent drive
  • 13 Tooth pulleys and decreased derailleur tension prevent high chain tension in low gears
  • Direct cable routing prevents snagging from any trail side hazards
  • Full carbon fibre outer pulley cage saves weight while alloy inner cage increases rigidity
  • Cold forged wide alloy links and pivot body
  • Four fluorine-coated link pin bushings
  • Strong return spring for a positive shifting feel
  • Specifically designed to work with XTR M9100 12-speed double drivetrains
  • Durable sealed 13 Tooth bearing pulleys for low friction
  • Top normal spring uses the spring to select higher gears
  • Max front difference 10 Tooth
  • 45 Tooth capacity SGS cage
  • Average weight 290g


  • Max low sprocket: 45 Tooth (2 x 12-speed)

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