If I wanted to spend the money to buy new wheels I would buy 15x10s for my 12.5s just because I mostly drive on the street, but then they would rub my front fenders and I would need a couple inches of lift to clear them.
For all street driving I would put them on 15x10s, but if you use it off-road a good bit I would rather not have to worry so much about losing a bead, most tire manufacturers recommend a 8.5-10" rim for 12.5" wide tires.
15.5" super swampers is another thing, their designed to run on 10" wide wheels. You couldn't get away with running a smaller 12.5" tire on a 7" wheel I don't think.
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1985 Scottsdale Shortbed 4x4
Stout 350 with some "upgrades"-700r4-33x12.5" Mud Tires, Warn 8274-50 winch.
2005 Chevrolet Colorado Regular Cab 2wd 4-banger, 5 speed, Street Pack with 3.73 axle.
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