Shimano GRX FC-RX820 1x12 Chainring - Four Bolt - 110 BCD - 51.1mm - Round - 42T - 12 Speed - Alloy YGroup_7033792266285 Air Mesh: Air Mesh is

Air Mesh: Air Mesh is equipped with fine pores for excellent air circulation and does not absorb moisture

offset press-stud closure and a zippered hip pocket

Note: Braze-on mount is not at the same height on all bikes so max chainring size will vary somewhat depending on frame brand and model

Sram and Campy compatible

and pronounced progressivity that’s designed for those conditions in which the only thing to do is to challenge the clock

Shimano GRX FC-RX820 1x12 Chainring - Four Bolt - 110 BCD - 51.1mm - Round - 42T - 12 Speed - Alloy YGroup_7033792266285 Air Mesh: Air Mesh isShimano chainring 40T and 42T for FC RX820 1, compatible with 12 speed system.