This suite of components brings an electronic option to the 2x12 GRX RX820 items launched last year. Like with the RX820 mechanical components, riders can tailor their gearing with the RX820 crank and its 48/31-tooth chainrings or the RX610 crank with 46/30-tooth chainrings. At the back of the bike, both the HG710 11-36-tooth cassette and the full complement of Shimano 12-speed 11-34-tooth cassettes are compatible.

RX825 compatible gearing options:

• 48/31T RX820 crank
 

• 11-36T HG710 cassette
 

• 11-34T R9200, R8100, R7100 cassettes

Any of these gearing combinations pairs perfectly with Shimano’s latest carbon gravel wheels, the WH-RX880. With 25-millimeter internal width and updated DIRECT ENGAGEMENT freehub, the RX880 wheels provide a vital connection between rider and road, however remote or rugged.

Like the very first GRX groups, the RX820 and RX610 systems employ a wider, +2.5mm chainline for improved tire clearance, allowing you to set up your bike exactly how you want without compromise.

At the front of the bike, Shimano’s 12-speed GRX Di2 features a wireless gravel-specific cockpit where raised hoods with ribbed surface texture and anti-slip brake levers provide ultimate hand security no matter how spicy your ride gets. That secure hand position is further enhanced, as it was with the original GRX RX815 Di2 shifters, with the location of the third Di2 button on the inside of the hood. Whether used as another shift location or for scrolling the screen on your GPS device so you don’t miss the next turn in your adventure, this third button is another way to fully experience Shimano’s electronic Di2 system.

The new Di2 system also allows for accessory shift buttons, another key advantage of electronic shifting. Plugging in one of Shimano’s satellite switches, whether on the tops, drops, or on aero bars, riders can more consistently maintain their effort without the need to move their hands. Like the third button on the GRX Di2 dual-control levers, these satellite switches can be assigned various functions including shifting of either derailleur, to control compatible lights and GPS devices, or as a lap button during workouts.

The new dual control levers also employ a gravel-optimized body shape cross-section for seamless integration with flared handlebars. Rounder in shape, the transfer from handlebar to hood is smoother and creates a larger surface area to help eliminate pressure points. With enhanced comfort, you can extend your day out a little longer.

It's these kinds of thoughtful customization options combined with Shimano’s legendarily precise and reliable electronic shifting that help make the expanded family of GRX components the ultimate worry-free choice for all types of gravel cyclists. So go ahead and plan your next ride, race, or multi-day adventure—and know that with Shimano GRX, you'll have the right gear—and gearing—to get you to the finish line, wherever that may be.