Originally Posted by Dominic Toretto
Mmmm, I wouldn't say they are idiots lol. One inch is 25.4mm. So 255mm/25.4 comes to 10.039 inches, so the tire should be wider than the 8.5inch rim, same for the rear. I do know that different manufacturers measure differently... somehow. I have BFGs with a 265 in the front on a 9inch wheel and the tire looks wider than that. Also have a 285 on my 10inch rears and the tires stick out much wider than the wheel.
Long answer short, his tires shouldn't be stretched based on the measurements unless I am doing it wrong.
-Alex
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That 255mm is section width, measured across the largest part of the tires, apex of the unflexed sidewall to the other apex. 8.5" wheels are measure inside of the beads of the wheels. Of you were to measure your front wheels, they would end up being about 9.5-9.75" tall from lip to lip.
I have 255s on my 9" wheels and there is barely any tire protecting the lips.