Shimano GRX FC-RX820 1x12 Chainring - Four Bolt - 110 BCD - 51.1mm - Round - 40T - 12 Speed - Alloy Dangerous Goods IGUS bushings keep the Topaz

IGUS bushings keep the Topaz running longer

this top features Hydrolix moisture management to wick away sweat and dry fast to keep you cool

the new 1900 Spline wheel line has been equipped with the new Ratchet LN freehub system

If the hanger is substantially bent you will need to replace it as the metal will fatigue and fail if you try to bend it back into place

Both the front and the back are reinforced with Hypalon panels

Shimano GRX FC-RX820 1x12 Chainring - Four Bolt - 110 BCD - 51.1mm - Round - 40T - 12 Speed - Alloy Dangerous Goods IGUS bushings keep the TopazShimano chainring 40T and 42T for FC RX820 1, compatible with 12 speed system.