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Check out the new 4 pot (yep..) Deore, SLX, XT or XTR calipers and see if they fit GRX.
AFAIK they have smaller pistons than their off road ZEE or Saint counterparts hence less displacement need when it comes to fluid and levers.
OR a Zee/Saint caliper might fit GRX.
Do report back once you have browsed through the tech docs yeah? ;)
coventry_eagle
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.