Shimano GRX 12-Speed Groupset ReviewMore gears, more possibilitiesGravel seeker or more used to a traditional road bike set-up? Shimano’s new 2x12 RX820 drivetrain gives you the best of both worlds. Gravel-specific 48T or 31T front chainrings paired with a 11-34 or 11-36 cassette deliver more control and more gears for every challenge – from hammering along the flats, cruising endless dirt road rollers or taking on the biggest climbs. The mechanical 12-speed set-up you’ve been waiting for. More gear choice and lower ranges without sacrificing gear steps. No rides are out of bounds with this all-road oriented option. With Shimano GRX, you are UNDROPPABLE. Best-in-class braking system The new GRX levers use SERVOWAVE tech, bringing a new level of control. The Dual Control Lever (ST-RX820) delivers light and responsive mechanical 12-speed shifting for mixed-terrain riding and racing (the ST-RX820-LA option integrates dropper post operation for a cleaner cockpit). The GRX disc brake calliper (BR-R820) brings enhanced modulation and a quicker initial braking point for fantastic stopping power on tricky terrain. Enhanced ergonomics Designed for use with flared handlebars – a gravel-cycling staple – the new brake/shift levers (ST-RX820) feature anti-slip texturing on the tops and dramatically improved ergonomics that lessen the pressure on your palms. A minimal update for the cockpit brings maximum comfort and control.