Shimano GRX FC-RX820 1x12 Speed Crankset - 68-70mm Shell - 24mm - Four Bolt - 110 BCD Asymmetric Shimano - 172.5mm - Black - 40T - 49.7mm Chainline PDP|PLP Straight hex shaft on the

Straight hex shaft on the short side

The wave-like shape and raised rear section provide perfect rearward support and an optimal pressure distribution which reaches deep into the body structures resulting in improved power transmission

the MK4 has been optimised for use with 2

Lightweight / breathable sleeve construction made from lycra and stretch mesh

with or without the tire mounted

Shimano GRX FC-RX820 1x12 Speed Crankset - 68-70mm Shell - 24mm - Four Bolt - 110 BCD Asymmetric Shimano - 172.5mm - Black - 40T - 49.7mm Chainline PDP|PLP Straight hex shaft on theThe SHIMANO FC RX820 1 crank balances weight savings, optimized efficiency and an array of gearing options that cater to the segmented demands of mixed terrain riding. By pairing a 10 45T or 10 51T cassette with 40T and 42T chainrings, riders can choose closer gear steps or ultimate range. The FC RX820 1 comes in 170, 172. 5, and 175 mm crank arm lengths, providing an additional level of customization.