The Shimano GRX FC-RX610 2x 12-Speed Crankset is your budget-friendly tough-as-nails double crankset for gravel adventure or touring 2xs. The RX610 2×12 crank features 4630 chainrings for ultra-low climbing performance and is available in 165 mm 170 mm 172.5 mm and 175 mm crank arm lengths.