This is a little equation I like to go by for proper tire width:
((Wheel Width * 25.4) + 25.4) = X, then round X to nearest available tire width.
Example, 9.5" wheel.
((9.5 * 25.4) + 25.4) = 266.7 = nearest tire width available would be 265.
So on a 9.5" wheel I would most likely run a 265 wide tire... 255 and 275 can also be options here.
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