Design flare: Shimano GRX Di2 goes 12sp, adds flare-optimised hoods and satellite shifters

New Shimano GRX 12 speed
(Image credit: Shimano)

Shimano GRX is very much a well-established part of the gravel scene now, and while last year saw the launch of a cabled 12-speed GRX, we are now seeing the launch of a 12-speed Di2 version. The headline changes are, beyond the addition of an additional sprocket, a revised hood design to better mesh with flared bars, and added button functionality as well as the ability to use satellite shifters. 

Like Dura-Ace, Ultegra, and 105, the new GRX Di2 (RX825 in Shimano coding) is semi-wireless, with wireless controls at the hoods, but a hardwired connection between the battery and the front and rear derailleurs. While we have seen a patent recently for a fully wireless, 13-speed Shimano groupset, it is at least now clear that this wasn’t a new GRX.

Swipe to scroll horizontally
ComponentWeight (g)SRP (£)SRP ($)
Shifters415 (pair)299.99-
Shifter set w/ disc caliper-799.98556.99
Front derailleur142184.99209.99
Rear derailleur310324.99409.99
Brake caliper (with flat mount adapter)146 (front), 136 (rear)79.99-
Brake caliper-74.99-
Cassette (Ultegra 11-34t)345119.9987.99
Cassette (HG710 11-36t)-84.99-
Rotors97 (140 mm), 114 (160 mm), 139 (180 mm), 169 (203 mm)54.99-

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Will Jones
Senior Tech Writer

Will joined the Cyclingnews team as a reviews writer in 2022, having previously written for Cyclist, BikeRadar and Advntr. He’s tried his hand at most cycling disciplines, from the standard mix of road, gravel, and mountain bike, to the more unusual like bike polo and tracklocross. He’s made his own bike frames, covered tech news from the biggest races on the planet, and published countless premium galleries thanks to his excellent photographic eye. Also, given he doesn’t ever ride indoors he’s become a real expert on foul-weather riding gear. His collection of bikes is a real smorgasbord, with everything from vintage-style steel tourers through to superlight flat bar hill climb machines.