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Shimano GRX RX820 12 Spd Groupset with Dropper Post Lever - 10-51t

Shimano GRX RX820 12 Spd Groupset with Dropper Post Lever - 10-51t

Regular price $1,572.92
Sale price $1,572.92
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Product ID: GM090723-78

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Shimano GRX RX820 12 Spd Groupset with Dropper Post Lever - 10-51t



The Shimano RX820 is a gravel-specific 1x12-speed groupset with a 40-tooth chainring and mountain bike cassette. The single chainring set-up is suitable for those who like things to be uncomplicated and are looking for an all-purpose crank for exploring, racing, high-speed sections and mountain crossings. In keeping with the slogan " unbeatable" , combine it with a 10-45 tooth cassette if you enjoy competing and appreciate weight savings. Or you can choose an " unstoppable" 10-51 tooth cassette if you love adventures with steep climbs and comfort is important to you. In both cases, you will benefit from the reliability, durability and simplicity of the GRX RX820. With this groupset, Shimano has once again expanded the range of its gravel components to reflect the spirit, individuality, sense of freedom and community of gravel enthusiasts. The groupset also includes a shift lever for the right, a brake lever for the left, the matching rear derailleur, a Quick-Link chain and flat-mount disc brakes.


  • Series: GRX RX820
  • Application: Gravel
  • Shifters & Derailleurs: 12-speed (mechanical)
  • Brakes: disc, hydraulic (flat mount)


  • Crank: 170.0 mm, 172.5 mm, 175.0 mm (gradation 40 teeth)
  • Cassette: 10-45, 10-51
  • Rear Derailleur: short/medium cage (10-45), long cage (10-51)


  • Shimano Micro-Spline freehubs (Shimano MTB 12-speed)


  • Mechanical-hydraulic GRX 12-speed groupset for gravel use (40 T crank, cassette, chain, rear derailleur, shift lever, brakes)
  • Uncomplicated, reliable and low-maintenance 1x setup
  • MTB cassette with 10-45 or 10-51 T depending on riding style
  • Light and efficient Hollowtech II crank with hollow crank arms
  • Smooth and defined shifting
  • Great brake control on mixed terrain
  • Gravel-specific lever and lever body ergonomics
  • Rear derailleur with Shadow Plus technology to prevent chain drop
  • Chain with 126 links


Shimano GRX RX820 1x12 40 groupset, consisting of:

  • 1 x Shimano GRX crankset (FC-RX820-1)
  • 1 x Shimano GRX rear derailleur (RD-RX822)
  • 1 x Shimano XT cassette (CS-M8100-12)
  • 1 x Shimano XT / Ultegra Quick-Link chain (CN-M8100)
  • 1 x Shimano GRX disc brake (BR-RX820 + BL-RX820), front
  • 1 x Shimano GRX disc brake (BR-RX820 + ST-RX820), rear
  • 1 x Shimano SM-BH90-JK-SSR brake hose, 1000 mm (front)
  • 1 x Shimano SM-BH90-JK-SSR brake hose, 1700 mm (rear)
  • 2 x pair Shimano resin brake pads with cooling fins
  • 1 x disc brake adapter for front 140/160 + 160/180 mm
  • 2 x hose connection sets
  • 2 x type A caliper bolts for front wheel
  • 2 x caliper bolts for 25 mm frame diameters, rear wheel
  • 1 x Shimano aluminium cassette lockring
  • 1 x Shimano master link
  • 1 x Shimano crank bolts
  • 1 x shifter cable
  • 2 x cable housings for rear wheel
  • 1 x Shimano OT-RS900 cable housing for the rear deailleur
  • 1 x long nose end cap for OT-RS900
  • brake set ready for assembly, filled, bleeding is recommended after assembly

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