315 75 R16 Tires
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The largest tire that can be fit on a stock truck is a 33/12.5 or a 305/70/16. We attempted to put a set of 315s on 10" wheels on an 01 F250 with X code springs (as high as you can get factory) and they would hit the front bumper hard on turns. To fit those it actually needed a 4" lift and comes close to rubbing now. If you stay with an 8" wheel you might get away with X code springs and a leveling kit.
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Originally Posted by dirk upson
i had 17x9s with 315s and they only rubbed on the plastic fender liner, and zip ties took care of the problem. it all depends upon back spacing. stock wheels shouldn't be a problem.
Stock backspacing on the wheels.
You're right in that the stock wheels might not make it rub, though if it does it will be on the springs. The problem here is that stock wheels are too narrow for anything wider than a 305. It puts too much stress on the bead area and will make the tires wear funny. Minimum recommended wheel width for a 315 is typically an 8" wheel.
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Originally Posted by Stroker73
so if i dont want to change my stock wheels (16x7) and dont want the tires to rub, my best bet would be 305 70 16's? right now i currently have the 285's on it
I wouldn't recommend a 305 series tire on stock wheels. Anything wider than a 285 is beyond the mfg recommended wheel size. It will make the tires wear faster/strangely. Plus if you run into a problem the tire mfg can void the treadlife warranty due to misapplication. Some stores won't install tires that wide on stock wheels. Can you do it, sure. Should you, I wouldn't on my truck.