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I suspect that because GRX only comes with flat mount calipers, and there's no Shimano standard for combining FM calipers with 180mm rotors.
Brommers-
Yeah, weird thing was that they didn’t list the br-rx810 as incompatible with the 180mm xt rotor.
Worst case scenario is me getting a pair of ugly ultegra rotors, but rather not.
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there's no Shimano standard for combining FM calipers with 180mm rotors.
There are adaptor to allow 180mm on flat mount however this depend on the fork maximum rotor sizes.
nogk
edscoble
I have a few questions regarding the grx brakes. My frame has the rear brake mount spaced for 180mm rotors and ive been looking at shimanos cross compatability charts to find rotors. I dont know if this is necessary or if i could just get any 180mm rotor. What threw me off was that the xt-rotor had specced only 160mm compatability for br-rx400.