Same shoe fitting as MTB SPD's.
It's not. the bolts are top and bottom and the slot is long, some shoes have a fitting thaqt does both,like these: but you can't put spd-r cleats on standard mtb spd shoes.
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It's not.

the bolts are top and bottom and the slot is long, some shoes have a fitting thaqt does both,like these: but you can't put spd-r cleats on standard mtb spd shoes.