Spend more time riding and less time tinkering with your gears on a Box Prime 9 setup

stiffer stanchion

This is the ultimate rear light for incredible daytime visibility and superior visibility after dark

ROLLER BEARING CLUTCH™ technology reduces bounce and chain slap

• Polarised and Iridium lens options available

Shimano GRX FC-RX820 1x12 Speed Crankset - 68-70mm Shell - 24mm - Four Bolt - 110 BCD Asymmetric Shimano - 175mm - Black - 42T - 49.7mm Chainline Images Uploaded - Ready for Review Spend more time riding andThe 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.