Good point about the measured wheel width, that's always important to consider because you can squeeze or stretch the section width quite a bit if your rim is narrower or wider than the measured rim.
And, I should have probably been more clear, just because my car would have about 13.5" to work with doesn't mean all of them will either. Got to measure your own car, some may have less, some may have more, and you might not have the exact same measurement on both sides. As the tires get wider and taller the clearance requirements increase too because you get more sidewall movement, and more effect on the tire clearance from putting the body or axle at an angle like with cornering or suspension travel (bumps etc).
And a 1/2" clearance is just a general rule for minimum clearance that I use. It's definitely the minimum to the quarters. And honestly I'm usually dealing with smaller tires than what we're discussing here.
That is a LOT of tire spacecowboy!!!:thumbsup:
