The 817/812 rear derailleurs support up to 42T where Ultegra maxes out at 34T similar to the 815/810. It’s easy to breeze through the gears and braking is refined and smooth.The gravel-specific hoods are comfortable and ergonomic.The provided gearing is a 40t chainring with the SLX 11-42 cassette. It comes in both 700c and 650b diameters.The mechanical options I reviewed deliver expanded the gearing options and outstanding shift performance for not just cyclocross and gravel, but all types of drop bar riding. Mine got a little loose and getting the shifting dialed in was vexing until I thought “let me check the bolt.” Sure enough, it was a little loose. And, as a PSA, don’t forget to check the rear derailleur bolt every so often — this is particularly important with gravel bikes. SHIMANO's new FC-RX810-2 crank balances weight and efficiency for mixed-terrain riding. Outlast everyone in the pack with the comfort and compliance of the redesigned full-carbon Cutthroat frame and fork and the precision performance of Shimano’s GRX 810 drivetrain. And, non-toxic mineral oil is always a winner. Shimano GRX is a component series designed for gravel and adventure riders, bikepackers and cyclocross racers, providing a wide spread of possible builds including 10-speed and 11-speed setups, 1x and 2x drivetrains, mechanical and electronic shifting, wide-range or close-range gears, and dropper post integration. You don't have to login or create an account to see shipping charges.Some manufacturers restrict where we can ship their products. Shimano Ultegra CN‑HG701 11‑Speed Chain. With that, you get a 40/42 gear ratio for steep climbs. © A. Yee / Cyclocross MagazineShimano’s gravel-oriented GRX mechanical components feature a 2x-oriented RX810 rear derailleur with a clutch that comes with oversized pulleys for more chain wrap. It’d be fabulous for them to be able to buy a 1x GRX ring to go 1x for cyclocross or gravel, but Shimano says the GRX 1x rings won’t quite fit despite the same BCD and number of bolt holes. Shimano GRX seatpost dropper left mechanical lever $244.99 GRX hydraulic disc brake calipers are flat mount designs that are offered in premium 810 series and 400 series. On paper, the 110mm four-arm BCD looks exactly the same as what its four-arm road cranksets use and third-parties have copied, but Shimano assured us that mix-and-match fans hoping to put a 46 or 50 tooth Ultegra ring on a GRX crank will be disappointed. Utah's Wasatch Mountains are his playground.In the hoods, shifting and braking is comfortable and reliable.The GRX 1x drivetrain has been solid and predictable.Shimano is the undisputed king of mechanical drivetrains and the new GRX RX810 is awesome. It’s easy to breeze through the gears and braking is refined and smooth. Even so, they still greatly expand your usable hand positions in technical terrain. I get it… it’s just a modified 2x lever, but I appreciate it when the levers are fixed (like Di2).Single-finger leverage in the drops is even more powerful.As far as braking goes, I love how Shimano’s hydraulic systems perform. Europe, however, gets a 10-speed 1x crankset as well.Shimano counters the Q-factor complaint by pointing to its shorter spindle XTR SPD M9100 pedal option. The wide-range 2x gearing will be welcomed by many road cyclists, while the 1x option could make an excellent commuter bike drivetrain.Shimano’s gravel-oriented GRX mechanical components offer wide range 2x gearing with a 48/31 chain ring combination. Shimano’s gravel-oriented GRX mechanical components, reviewed. I’d love the ability to mount them wider on the bars for a position closer to a mountain bike flat bar, but still feel the braking convenience is worth the weight penalty.Shimano GRX components feature 1x, 2x, Di2 and mechanical options.