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TRP G-Spec TR12 M850 Shifting Kit - Shifter + Rear Derailleur - 12-speed - black/gold

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Description of TRP G-Spec TR12 M850 Shifting Kit - Shifter + Rear Derailleur - 12-speed - black/gold


Rippin’ trails like there’s no tomorrow

The TR12 provides World Cup downhill shifting technologie


The two TRP drivetrain systems TR12 and DH7 are the result of an intimate development relationship with 5-times DH World Cup Overall Champion Aaron Gwin and his personal mechanic John Hall. In 2019, the TRP DH7 had its extensive first season which was crucial for providing additional development input for the TR12 components.



TRP G-Spec TR12 SL-M850 shifting lever

Sequential shifting – like a Rally car. Speed of shifting is key to Aaron, which is why he wanted something a little different. As a result, TRP engineers looked at the cable release lever and devised the Linear Release Action system to move it in a linear path to mimic the motion of a rider’s thumb, rather than rotating it away. This unique positioning allows for a more consistent contact patch providing overall better grip and shifting performance when the trail gets rowdy.


Technical details of the 12-speed shifter:

  • sequential „Speed Shifting“
  • linear actuation (Linear Release Action) for improved ergonomics and consistent thumb contact
  • wave design: embossed grooves on lever paddles for enhanced grip and tactile feel
  • carbon fiber upper housing and advance lever
  • rider adjustable home position of lower lever with a 40° range
  • tool-free straight lace cable changes
  • weight: approx. 120 grams (manufacturer's specs)


  • upper housing, push lever: carbon
  • release lever: aluminium (forged)
  • ball bearings: stainless steel (sealed)


TRP G-Spec TR12 RD-M850 rear derailleur

One key drivetrain feature that separates the TRP TR12 derailleur from the cycling industries existing products is the Hall Lock, named after Aaron Gwin’s mechanic, John Hall. The Hall Lock is a lever integrated into the derailleur mount which locks the movement of the B-knuckle around the mounting bolt when closed. The Hall Lock can be opened to easily remove the rear wheel. When closed, it provides additional stability and less noise to the shifting perfomance.

A second key TR12 rear derailleur feature is the adjustable Ratchet Clutch. Depending on the suspension layout of the bike, there can be different amounts of chain growth. This is why the team designed adjustability into TRP‘s ratchet style clutch. If a rider wants to free up the system, he or she can back off the clutch to balance pedal feedback with chain retention. This provides the ultimate personalized feel as the drivetrain works in unison with the suspension setup and riding style.


Technical details of the 12-speed derailleur:

  • max. sprocket size: 51 teeth
  • guide pulley (upper): 11 teeth
  • tension pulley (lower): 15 teeth
  • G-Spec details / finishing touches:
    outer cage and upper link made of carbon fibers,
    extra wide parallelogram pivot,
    sealed cartridge bearings pulleys
  • Hall Lock function
  • Ratchet Clutch for increased chain stability
  • chain length indicator
  • weight: approx. 282 grams (manufacturer's specs)


  • outer cage: carbon
  • inner cage: aluminium (forged)
  • spring: stainless steel
  • bearings: stainless steel (sealed)
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Fact Sheet of TRP G-Spec TR12 M850 Shifting Kit - Shifter + Rear Derailleur - 12-speed - black/gold

Product Name: TRP G-Spec TR12 M850 Shifting Kit - Shifter + Rear Derailleur - 12-speed - black/gold
Manufacturer: TRP
Item Code: TRP479997
activity: Bike
material: Aluminium, Carbon
usage bikesport: MTB
shifting system: 12-speed
shifting actuation: Mechanical
rear derailleur cage: long
rear derailleur max. teeth: 51
Model year: 2021
Color: Black, Gold
weight: 402g
manufacturer item code: ABDS000003
Dangerous goods: no
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