The Shimano GRX RX810 crankset is for 11 speed.

GRX is a brand new series of gear components for gravel and cross. Shimano has asked a lot of riders in gravel and cross-riding about what they want in a new gear group so that it is the best possible fit for those who ride in that terrain.

The chainring is 48/31T, which is a really good choice for mixed terrain, both for when the hills are steep and when you need to go fast on the long flat sections.

The pedal arm is 170mm long.