Shimano GRX 12-speed finally makes the leap to 1X (but only if you're ready)

Shimano is bringing its GRX gravel groupset up to date with a 12-speed option and, finally, a wide-range one-by setup. But, for those not quite ready to make the leap to ditch front derailleurs entirely, there is also a 12-speed two-by version of GRX coming out. In fact, there are three different versions of 12-speed GRX all being released at once. That gives riders quite a comprehensive range of gearing options in the new 12-speed gravel group. Unless you want electronic shifting, that is. The new 12-speed GRX is, for now, only available with mechanical shifting.

We had a chance to try out the 12-speed GRX group in the dust and dirt of Oregon recently and are working through a long-term test closer to home. Read on for all the details of Shimano’s new gravel group and our first impressions of the 1x wide range option.

Shimano GRX in 2×12-speed set-up

Shimano GRX: Going past 11

The major change to GRX is, of course, that Shimano finally has a 12-speed gravel-specific group to compete with its drivetrain rivals. But it’s not just one drivetrain. There are three different versions of the new 820 line (and a 12-speed GRX 610 line, too). All of this is mechanical, with hydraulic shifting. There is not a wire in sight. But, in Di2’s absence, Shimano did come up with clever code names to keep the groups straight. They are Unbeatable, Unstoppable for the two 1x options. And, with a wink and a nudge, Undroppable for the 2x group.

Undroppable: GRX keeps 2-by alive

While Shimano has faced criticism in some circles for not keeping up with competitors’ 1x options, the excellent performance of its front derailleurs has always been a solid counterpoint. The Japanese component giant is now embracing 1x, but it didn’t see any reason to let that advantage go. In fact, the front derailleur is updated with an additional 2.5mm outboard clearance for better tire and mud clearance for the new GRX.

GRX 12-speed comes with a 48-31t front chainring combo and the option of 11-34 or 11-36 cassettes. This option also comes with its own derailleur (RD-RX820) and uses the HGL2 freehub standard. That lets Shimano borrow cassettes from its road line instead of developing new gravel-specific gearing.