The beauty of the radial mount design is adjusting pad placement is as easy as adding spacers or removing a little more material. When I first made my bracket a made sure to leave an extra 5mm of material where the caliper bolts up. Then after measuring it when mounted I just faced off the extra material so my pads sit right at the outer edge of the rotor to give it the largest possible effective diameter. If I ever wanted to go to a bigger rotor then I just add in some spacers.
Even if your MC is to small your brakes should still grab hard if everything was done right. The only thing is your lever will feel a bit squishy.
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