12 speed. 6 pieces (GRX ST-RX820 Hydraulic STI levers with hoses, RX820 Flat Mount Hydraulic brake calipers - front and rear, bottom bracket, RX820 1x ring crankset, Deore XT chain and RX820 or RX822 rear derailleur). Rotors can be purchased as an Optional Purchase.
Key Features:
The new 12 speed GRX is a much-anticipated update to Shimano's gravel shifting range, bringing its gravel groupset that has been predominantly best suited for 2x setups in line with competitors' offerings. After its pre-launch runs in the wild at multiple gravel races, we've now got all the official details of the 12 speed version of the groupset giant's gravel-specific components.
The largest change is obviously the addition of another gear to the setup, in this case meaning the GRX 820-series has a 10t smallest sprocket. This has been allowed by adopting the Microspline-free body and redesigning the rear derailleur.
Although the changes are visually minimal, the 12 speed GRX comes with revamped GRX shift and brake levers which Shimano says enhance control through pressure point reduction and increased surface area. They have also been optimized for flared drop bars commonly used by gravel riders.
In conjunction with the 12 speed GRX, Shimano has also introduced a 12 speed 105 groupset to its lineup, and a set of new gravel wheels.
1x12 GRX:
Unbeatable
The Unbeatable retains the smooth and reliable shifting of its 11 speed predecessor while introducing a broader gear range and an extra cog. The setup is designed for riders chasing personal bests and competitive races and combines a 11-34, 11-36, 10-45 or 10-51t cassette with a 40-tooth or 42-tooth chainring. According to Shimano, this adaptation simplifies maintaining an optimal cadence in the midst of pack riding and intense racing scenarios.
The setup incorporates the RD-RX822-GS medium cage rear derailleur, equipped with the integrated Shadow RD+ chain stabilizer (aka clutch) for smoother, quieter shifts and chain security on rugged terrains.
Unstoppable
The Unstoppable is upping the game in terms of gearing, and Shimano says it's targeted for lengthier adventures and arduous climbs. The Unstoppable configuration features a 11-34, 11-36, 10-45 or 10-51t cassette paired with a 40-tooth or 42-tooth chainring.
This version uses the RD-RX822-GSG long-cage rear derailleur, again combined with the Shadow RD+ chain stabilizer. A novel feature of this GRX generation is the capability to interchange or replace only the derailleur cage across 1x12 options, which adds adaptability without necessitating the replacement of the entire derailleur.
The Unstoppable setup also brings the Micro Spline mountain bike hub technology to the gravel offerings, ensuring durability and reduced cog wear over time.
Undroppable
Shimano's GRX lineup has always offered a 2x option and it's not changing with this launch. Un-droppable is the only 2x option in the new 12-speed range and caters to riders seeking the most versatile experience. This drivetrain pairs gravel-optimized 48/31t front chainrings with an 11-34t or 11-36t cassette for 2x configuration. Being a 2x12 setup, it delivers the widest gear range in the lineup, suitable for comfortable cruising, tackling challenging dirt roads, or confronting steep backcountry climbs.
The 2x GRX features an FD-RX820 front derailleur with toggle link construction offering varied cable routing options, wider tire clearance, and precise mechanical front and rear shifting. At the rear, the mech gets the same Shadow RD+ chain stabilizer as the other setups to enhance drivetrain stability over uneven terrains.
Unmatchable
The 1x GRX features rear derailleur, mechanical gets the same Shadow RD+ chain stabilizer as the other setups to enhance drivetrain stability over uneven terrains. Designed for riders chasing personal bests and competitive races and combines a 11-34, 11-36, 10-45 or 10-51t cassette options.
Detailed GRX RX820 & RX822 1x12 Speed Groupset Components:
Shifters and Calipers:
- 1x ST-RX820 GRX 12 speed STI Shifter, right rear with pre-bled GRX Caliper
- 1x BL-RX820 GRX 1x for Single Shifter, left front with pre-bled GRX Caliper
Rotors:
- 2x RT-CL800 disc rotor (Optional Purchase)
820-822 series Derailleurs:
- 1x Shimano GRX Derailleurs RD-RX820 (max 36t for double), 2 x RD-RX822 type to match cassette - GS (max 45t) or SGS (max 51t)
820-series Cranksets and Chainrings:
- 1x Single chainrings are available with 170mm, 172.5mm or 175mm cranks arms and 40t or 42t chainrings
- 2x Double crank arms come with the same three crank lengths above with 48/31t chainrings.
Chain:
- CN-M8100 Chain, DEORE XT, HG 12 Speed
Bottom Bracket:
- Ultegra SM-BBR60
- Ultegra SM -BB7241B
Technologies Explained - Hyperglide+ SHIMANO from Ride Shimano
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