As a comparison of relative tire clearance between the Shimano BR-R650 and the Racer Medium, I’m building up a bike designed for the Racer M and did a quick comparison. This is with a 35c GravelKing and it just clears the caliper but has tons of room on the centerpull. This is largely due to the location of the mounting hole on the fork. The pads in the caliper are nowhere near the bottom of their track, and another frame I have with the same calipers clears a 38c tire. So it’s the frame, not the calipers in this case.
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