Shimano GRX FC-RX610 2 x 12 Speed Gravel ChainsetShimano GRX FC RX610 2x Gravel Chainset The SHIMANO FC RX610 2 balances weight savings and optimized efficiency for mixed terrain riding and racing. Gearing options cater to the segmented demands of gravel cycling, maintaining the tighter gear steps needed to maintain your position in the bunch. The 2x12 speed crank utilizes a 46 30T chainring combination and comes in a 175mm crank arm length. Shimano GRX, with its gravel specific ergonomics,