The complete Gravel Shimano GRX 820 2x12-speed groupset is designed for cyclists looking for a high-performance, reliable and versatile mechanical drivetrain for their adventures on all terrains. Developed specifically for gravel riding, the GRX RX820 groupset Shimano combines ergonomics suited to rough terrain, optimised gear ratios and powerful, progressive hydraulic braking.
With its 48/31-tooth double chainring and 12-speed cassette, it offers a wide range of gear ratios, making it equally suited to long, rolling stretches, demanding climbs and technical trails.
A precise and versatile mechanical drivetrain
The GRX RX820 groupset from Shimano features a 2x12-speed mechanical drivetrain offering smooth and precise gear changes. Its FC-RX820-2 crankset, fitted with 48/31-tooth chainrings, allows you to maintain a comfortable cadence whatever the challenges of the route.
The RD-RX820 rear derailleur incorporates Shimano ’s SHADOW RD+ technology with a chain stabiliser. This system limits chain movement on rough terrain, reduces unwanted noise and improves drivetrain stability.
The 12-speed cassette, available in 11-34 or 11-36 tooth configurations depending on the model, offers a gear range suited to the various aspects of gravel cycling.
Ergonomics designed for gravel riding
The GRX ST-RX820 ‘ Shimano ’ shifters are specifically designed for gravel riding. Their ergonomic shape improves grip and comfort, particularly on extended rides over uneven terrain.
Their texture and positioning make it easier to control the bike, even when conditions become challenging.
Powerful and controlled hydraulic braking
The groupset is fitted with Shimano GRX BR-RX820 hydraulic disc brakes. They offer excellent braking power, precise modulation and consistent performance, whether on the road, on gravel or on technical descents.
The hydraulic system ensures effective braking with minimal effort on the levers, a significant advantage on long rides and hilly routes.
The Shimano GRX 820 2x12-speed system is therefore a comprehensive and well-balanced solution for cyclists wishing to fit their gravel bike with a high-end mechanical drivetrain that is robust and suited to intensive use.
Technical specifications
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Feature
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Details
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Brand
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Shimano
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Range
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GRX
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Series
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RX820
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Transmission type
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Manual
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Number of gears
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2 x 12
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Controls
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Shimano GRX ST-RX820
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Front derailleur
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Shimano FD-RX820
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Rear derailleur
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Shimano RD-RX820
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Rear derailleur technology
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SHADOW RD+
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Crankset
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Shimano GRX FC-RX820-2
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Chainring combination
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48/31 teeth
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Cassette
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Shimano 12-speed 11-34 or 11-36 teeth
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Chain
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Shimano CN-M8100 12-speed
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Braking
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Hydraulic disc brakes
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Calipers
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Shimano GRX BR-RX820
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Discs
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Shimano Centre Lock, depending on configuration
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Caliper mounting
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Flat Mount
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Use
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Gravel, sport touring, bikepacking
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Key benefits
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Precise and reliable 12-speed mechanical drivetrain.
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48/31-tooth double chainring for great versatility.
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SHADOW RD+ chain stabiliser for rough terrain.
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Powerful and progressive hydraulic braking.
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Ergonomic levers specially developed for gravel riding.
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Compatible with suitable 12-speed Shimano cassettes.
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Easy maintenance and adjustments thanks to a mechanical drivetrain.
Groupset components:
FCR820DX81 GRX820 crankset 172.5mm 48-31
SMBB7241B BB7241B Pressfit bottom bracket
RDRX820 GRX 820 12-speed rear derailleur
FDRX820F GRX 820 brazed-on front derailleur
CNM8100118Q M8100 118L 12-speed QuickLink chain
CSHG71012136 HG710 cassette 12-speed 11-36
RTCL800S 2x RTCL800 160mm disc
RX8202DLF6RX100 GRX820 2-speed left lever
RX8202DRRDSC170A GRX820 12-speed right-hand shifter
