Shimano GRX FC-RX820 2x12 Speed Crankset - 68-70mm Shell - 24mm - Four Bolt - 110-80 BCD Asymmetric Shimano - 170mm - Black - 48-31T - 47mm Chainline YGroup_7506298765357 The redesigned Bomber Z1 gives

The redesigned Bomber Z1 gives even more riders access to this celebrated Marzocchi workhorse

Battery Auto Save (Lighting mode automatically changes to slow flashing when the battery power gets low)

but it's still at it's best on hardpack or loose over hard

soft shell carrying case

Shimano GRX FC-RX820 2x12 Speed Crankset - 68-70mm Shell - 24mm - Four Bolt - 110-80 BCD Asymmetric Shimano - 170mm - Black - 48-31T - 47mm Chainline YGroup_7506298765357 The redesigned Bomber Z1 givesThe SHIMANO FC RX820 2 balances weight savings and optimal efficiency for mixed terrain riding and racing. Double chainring gearing caters 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 48 31T chainring and comes in 170, 172. 5, and 175 mm crank arm lengths.