SHIMANO GRX RX820 12 SPEED 1X GROUPSET. 172.5MM 40T CRANKSET WITH 10-45T CASSETTE. As new gravel groupset – fitted for a new build project but for long-winded reasons I have switched to a SRAM groupset. This is the very latest 12 speed GRX 820 groupset and it completed one short ride only – the entire groupset is immaculate and is being removed from the build for sale. The groupset includes the following items (basically an entire groupset without rotors). GRX RX820 1x cranks, 172.5mm and 40T chainring. Ultegra BBR60 English / BSA threaded bottom bracket. XT M8100 Cassette – 12 speed – 10-45T. 12 speed Shimano chain. GRX RX822 Rear Derailleur – medium cage GS / 12 speed / for up to 45T. GRX RX820 Front Disc Brake STI & RX820 flat mount caliper with 1000mm hose. GRX RX820 Rear Disc Brake STI & RX820 flat mount caliper with 1700mm hose. The groupset is fitted to a size 58 bike and so there should be enough brake hose to fit the vast majority of frames. I will include new inserts and olives so the hose can be cut and installed.