INTRODUCING SHIMANO GRX MECHANICAL 12-SPEED COMPONENTS

More gearing options for the heart and soul of gravel cycling

With the introduction of Shimano GRX RX820 12-speed mechanical components, Shimano continues its legacy of innovation as the originator of gravel-specific componentry. Rooted in simplicity, reliability, and adventure, the new 12-speed GRX lineup delivers more gearing options along with unrivaled ergonomics, so riders get the most out of each unpaved adventure, wherever that might be.

With a focus on the heart and soul of gravel cycling, Shimano mechanical GRX receives this 12-speed upgrade delivering top-tier performance without an over-the-top price. Since gravel is all about personal expression and freedom to choose how and where to ride, Shimano GRX includes three unique 12-speed mechanical drivetrain personalities to cover the full spectrum of riders and rides.

UNBEATABLE – SHIMANO GRX 1×12 with 10-45T

Riders who love pushing for personal bests or duking it out at the sharp end of a race, will appreciate the gear steps of the RX820 1×12 UNBEATABLE setup with a 10-45 cassette paired with a 40- or 42-tooth chainring. Like its 11-speed predecessor, RX820 delivers smooth, reliable shifting and now features a wider gear range and extra cog, making it easier to find the optimal cadence for maintaining your position in the pack.

This setup employs the RD-RX822-GS medium cage rear derailleur designed for use with the 10-45T cassette and includes Shimano’s integrated SHADOW RD+ chain stabilizer — providing quieter shifting and secure chain management in rough terrain.

FC-RX820-1 Crankset

1×12-speed gearing
Crank arm lengths: 170mm, 172.5mm, 175mm
Chainring options: 40T, 42T
SHIMANO HOLLOWTECH II construction
Weight: 655 grams (172.5mm with 40T chainring)

RD-RX822-GS Rear Derailleur

SHIMANO SHADOW RD+ Chain Stabilization
Max cassette range: 45T
Interchangeable, replaceable GS/SGS derailleur cage
Weight: 290 grams

CS-M8100-12 Cassette

Freehub type: MICRO SPLINE
10-45T range
Weight: 461 grams

UNSTOPPABLE – SHIMANO GRX 1×12 with 10-51T

For all-day—or multi-day—adventures heavy on climbing, the new RX820 1×12 UNSTOPPABLE option features Shimano’s wide-range, 10-51T cassette along with a 40- or 42-tooth chainring. This setup delivers optimal climbing gears for the steepest fire roads or high mountain ascents.

The UNSTOPPABLE 1×12-speed setup includes the RD-RX822-GSG long-cage rear derailleur with integrated SHADOW RD+ chain stabilizer that is optimized for use with the 10-51T cassette.

New for this generation of GRX is the ability to change or replace the derailleur cage between 1×12 options. This means if you need to replace your cage or your gearing needs to change, you don’t have to buy a whole new derailleur.

Additionally, Shimano brings its proven MICRO SPLINE mountain bike hub technology to gravel with both 1×12 mechanical GRX setups. This lightweight aluminum freehub design seamlessly integrates with 10-tooth top gears and features smaller, more widely spaced splines that limit cog damage over time.

RD-RX822-SGS Rear Derailleur

12-speed
SHIMANO SHADOW RD+ Chain Stabilization
Max cassette range: 51T
Interchangeable, replaceable GS/SGS derailleur cage
Weight: 288 grams (SGS)

FC-RX820-1 Crankset

1×12-speed gearing
Crank arm lengths: 170 mm, 172.5 mm, 175 mm
Chainring options: 40T, 42T
SHIMANO HOLLOWTECH II construction
Weight: 655 grams (172.5 with 40T chainring)

CS-M8100-12 Cassette

Freehub type: MICRO SPLINE
10-51T
Weight: 470 grams

UNDROPPABLE – SHIMANO GRX 2×12

For riders seeking the best of both worlds, the new 2×12 RX820 UNDROPPABLE drivetrain utilizes gravel-optimized 48/31T front chainrings paired with an 11-34T or 11-36T cassette. This setup delivers an ultra-wide gear range for spinning a comfortable cadence when cruising the flats, smashing endless dirt road rollers, or tackling a massive backcountry climb.

This option delivers precise mechanical front and rear shifting and features integrated SHADOW RD+ chain stabilizer for ultimate drivetrain security over bumpy terrain. It maintains tighter rear cassette gear steps, ideal for subtle cadence changes during competitive racing and spirited weekend group rides. The 2×12 setup seamlessly interfaces with most existing 700c wheels thanks to its use of the tried-and-true HG freehub body design.

FC-RX820-2 Crankset

2×12-speed gearing
Crank arm lengths: 170 mm, 172.5 mm, 175 mm
Chainring combination: 48-31T
SHIMANO HOLLOWTECH II construction
Weight: 721 grams (172.5 with 48/31T chainrings)

RD-RX820 Rear Derailleur

12-speed
SHIMANO SHADOW RD+ Chain Stabilization
Max cassette range: 36T
Weight: 270 grams

FD-RX820 Front Derailleur

2×12-speed gearing
Toggle link construction offers more cable routing options
Wider tire clearance (chainline +2.5mm vs. conventional road FD)
Precise and easy adjustment with integrated cable tension adjustment
Weight: 95 grams

CS-R8101-12 and CS-HG710-12 Cassette

CS-R8101-12 range: 11-34T
Weight: 345 grams
Freehub type: HG and HG L2

CS-HG710-12 range: 11-36T
Weight: 391 grams
Freehub type: HG and HG L2

Updated Ergonomics and Brakes

GRX’s ergonomic distinctiveness continues with its redesigned shift/brake levers. Adding 12-speed shifting without any additional lever bulk, the RX820 series shifters are designed for all-day comfort when using flared drop bars–a gravel cycling staple. By reducing pressure points and increasing surface area, your hands will feel less fatigued, and you’ll be better in control as you test your limits.

The new GRX shift/brake levers offer light and responsive mechanical 12-speed shifting. While the left lever of the UNDROPPABLE 2×12 GRX group delivers Shimano’s unrivaled smooth front shifting, the new 1×12 groups carry over functions for the left lever first introduced with the original GRX: a brake lever-only model and a dropper-specific option that seamlessly integrates braking and dropper post actuation.

ST-RX820-R/L – Hydraulic Disc Brake DUAL CONTROL Lever

Gravel-specific brake lever and bracket ergonomics
Optimized for use with flared handlebar
Anti-slip coating on brake lever surface
Light and responsive mechanical shifting
Weight: 572.5 grams (2×12 ST pair)
Weight: 511.2 grams (1×12 ST pair)

ST-RX820-LA – Hydraulic Disc Brake and Dropper Lever

Left side brake and dropper post lever
Gravel-specific brake lever and bracket ergonomics
Optimized for use with flared handlebar
Anti-slip coating on brake lever surface
Weight: 263 grams

BL-RX820-L – Hydraulic Disc Brake Only

Left side brake lever
Gravel-specific brake lever and bracket ergonomics
Optimized for use with flared handlebar
Anti-slip coating on brake lever surface

Weight: 222 grams

SHIMANO GRX RX610

For the more budget conscious consumer and to allow a wider price range on complete gravel bikes, Shimano has also updated its 600-series cranks and shift levers for 1×12 and 2×12 setups that utilize trickle-down technology from the original 800 series GRX component line.

Top features include textured hoods and anti-slip brake lever coating that bolsters control on rugged terrain. The new cranksets offer gearing options that specifically cater to the demands of gravel riding. The RX610 2×12 crank features 46/30 chainrings and is available in 165 mm, 170 mm, 172.5 mm, and 175 mm crank arm lengths. The RX610 1×12 crank has the same four crank length options and is available with highly durable steel 38T (a new option) and 40T chainrings to pair with a 10-45T or 10-51T cassette.

FC-RX610-1 Crankset

1×12-speed gearing
Crank arm lengths: 165 mm, 170 mm, 172.5 mm, 175 mm
Chainring options: 38T and 40T
Weight: 815 grams (with 40T chainring)

FC-RX610-2 Crankset

2×12-speed gearing
Crank arm lengths: 165 mm, 170 mm, 172.5 mm, 175 mm
Chainring combination: 46-30T

ST-RX610-R/L – Hydraulic Disc Brake DUAL CONTROL Lever

Gravel-specific brake lever and bracket ergonomics
Anti-slip coating on brake lever surface
Light and responsive mechanical shifting
Weight: 611 grams (2×12 pair)
Weight: 542 grams (1×12 pair)

BL-RX610-L – Hydraulic Disc Brake Only

Left side brake lever
Gravel-specific brake lever and bracket ergonomics
Anti-slip coating on brake lever surface

SHIMANO RX880 Carbon Gravel Wheels

Along with GRX mechanical components, Shimano is also introducing an updated carbon gravel wheel that’s purpose-built to handle the rough-and-tumble rigors of dirt road riding. The new RX880 wheelset is a full 64 grams lighter per pair than its predecessor and features the same shallow 32mm rim height for faster acceleration and quicker climbing. The RX880 wheels are tubeless-ready and employ a progressive 25 mm inner rim width that’s suitable for tires from 32 mm to 50 mm wide.

User-friendly compatibility is further enhanced via a revamped DIRECT ENGAGEMENT hub design, borrowed from DURA-ACE wheels, that easily converts between MICRO SPLINE and HG L2 12-speed freehub bodies. It features quick and efficient engagement for rapid acceleration no matter what the riding surface. The RX880 hubs and rims are laced with 24 J-bend spokes front and rear that maximize strength and reliability no matter how adventurous your next ride gets.

WH-RX880-TL Carbon Tubeless Wheels

DIRECT ENGAGEMENT freehub
Rim height: 32mm
Internal width: 25mm
Full carbon rim
Recommended tire size: 32-50mm
Replaceable freehub body – switch between MICRO SPLINE and HG L2 (Note: Not compatible with 11-speed HG cassettes)
Weight: 1394 grams (MICRO SPLINE)
Weight: 1397 grams (HG L2)