Shimano GRX RX820 2×12 Speed Mechanical Groupset



5 in stock


Build up your ultimate multi-terrain drop bar bike by adding a Shimano GRX 820 2×12 Speed Mechanical Groupset. It offers you the perfect gearing ratio for spinning up to speed and attacking technical offroad climbs, plus powerful disc brakes for precise speed control.

Product description

Shimano GRX, with its gravel specific ergonomics, optimised gearing options, rugged reliability, and quiet and stable drivetrain, sets itself apart from the rest of the component world.

This Shimano GRX 2×12 Speed groupset comes with the following:

Shimano GRX ST-RX820 2×12-Speed STI gear/brake levers

Bringing you the slick shifts, fine speed control and reliable hand grip needed for tough mix terrain rides, the Shimano GRX ST-RX820 levers will help you to get the best from your cyclocross (CX) or gravel bike.


  • GRX hydraulic disc brake 12-speed STI’s give you control, modulation and power with minimal effort in all riding conditions
  • Higher brake lever axis and curved brake lever, improves grip and confidence on choppy surfaces and descents
  • Raised hood head prevents hand misalignment and slippage
  • Recessed finger notch prevents upward slipping
  • Anti-slip texture and brake lever coating gives higher braking efficiency and reduces fatigue on long rides
  • Low profile flat mount design GRX hydraulic disc brake calliper gives you control, modulation and power with minimal effort in all riding conditions
  • Simple set up and maintenance with easy and clean bleeding system
  • Kit contains bled ST-RX820 STI lever, BR-RX820 flat mount front brake calliper with pads, and hose

Shimano GRX FD-RX820 2×12-Speed front Derailleur, Braze-On

Sitting at the heart of your gravel or cyclocross (CX) bike’s drivetrain, the GRX FD-RX820 front derailleur ensures fast, precise shifts even in tough conditions. Offroad-specific, it’s compatible with up to a 50 tooth outer chainring and designed for use with wider tyres.


  • 12-speed front derailleur for fast and precise shifting performance
  • Wider tyre clearance with plus 2.5 mm chainline versus conventional road front derailleur
  • Braze-on fit as standard; if your bike does not have a braze-on mount seat tube adapters are available (SM-AD91)
  • Compatible with 12-speed Hyperglide+ chains
  • Wide range 17T capacity – 46-50T outer chainring
  • For use with double chainset

Shimano GRX RD-RX820 2×12-speed rear derailleur, Shadow+

The 2×12 version of the GRX RD-RX820 rear derailleur will deliver lightning-quick shifts and outstanding chain retention as you’re taking on the toughest trails in the harshest conditions. Its stable performance is thanks to Shimano’s “Shadow Plus” cage design.


  • Low profile Shadow Plus design 12-speed rear derailleur for fast and precise shifting performance
  • Shadow Plus uses a chain stabilising switch that when on will reduce chain bounce in rough terrain maintaining more stable drive and shifting
  • High tolerance cold forged aluminium link plates and body construction is extremely light and durable
  • Compatible with 12-speed Hyperglide+ chains
  • Wide gear ratio compatible up to 11-36T
  • For use with double chainset

Shimano GRX FC-RX820 48/31T Chainset

Sitting at the heart of your gravel or cyclocross (CX) bike’s 2×12 speed drivetrain, the GRX FC-RX820 48/31T Chainset delivers ultra-efficient power delivery and the gear range you need for dominating all terrain types.


  • The HollowTech II 12-speed chainset offers optimum gearing for mixed terrains and riding styles
  • Designed to work with HollowTech II type bottom bracket cups
  • Compatible with 12-speed Hyperglide+ chains
  • Anodized aluminium crank arms
  • Lightweight aluminium chainring
  • 4 arm, 110 mm bolt circle diameter (BCD)

Shimano R710 12 Speed 11-36T or 11-34T Cassette

With tough steel cogs and an aluminium spider, the Shimano R7101 12 Speed Cassette is designed for maximum durability and performance on every mile. Part of Shimano’s pioneering R7100 series, this 12 speed model also comes equipped with an 11-36T ratio, making it perfect for everything from sprinting on the flat to climbing steep inclines on your road, gravel or cyclocross (CX) bike.


  • Cogs Material: Steel
  • Spider Material: Aluminium
  • Speed: 12 Speed
  • Chain Compatibility: HG 12 speed
  • Freehub Compatibility: Shimano 11 and 12 speed freehub bodies
  • Tooth Count: 11-36T or 11-34T
  • Tooth Combination: 11-12-13-14-15-17-19-21-24-28-32-36T

Shimano XT/Ultegra CN-M8100 Chain

The XT/Ultegra M8100 12 Speed Chain from Shimano is strong and durable for smooth gear shifts anywhere . Powerful and reliable, even under load, it’s optimised for use with all of Shimano’s 12-Speed drivetrains.


  • Speed: 12 speed
  • Use: MTB, Road, CX, Gravel
  • Length: 126 links
  • Quick Link: Quick Link easy connection
  • Non-reusable link
  • Weight: 252g (approx.)

Rotors (Optional)

Shimano CL-800 140mm or 160mm Centerlock

Bottom Bracket (Optional):
SM-BBR60 (68/70mm) HOLLOWTECH II, Threaded
SM-BB72-41 (86.5mm) HOLLOWTECH II, Press-Fit

Please Note: All required gear inner cables and outer cables come with this groupset. Also, the hydraulic brakes are pre-bled and ready for installation.




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