On my 32 I run 33gtst calipers on dogbones to fit 324mm (33gtr) DBA4000 rotors, DS2500 pads, braided lines and a master cyl stopper.
Way more braking than street tyres can handle (haven't run full slicks so can't comment on that).
They BARELY fit under 34GTT rims, there was like 1mm of clearance from outside of caliper to inside of wheel.