Yes you can. I have 16.5X12 rims and have ran 33, 35 and currently 37-12.50's with no problems. No odd wearing or trouble keeping them on the bead. In fact the only problem I ever found was getting ahold of a bead blaster to seat them!
Did you ever mount your 12.50 tires on your 12 wheels? How did t do? I also have some 37X12.50X16.5 tires and am currently looking for 16.5X12 wheels to put them on. Any help would be greatly appreciated.
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