Quote:
Originally posted by shhrtbs:
what's the best way to measure true tire size? toyo specs mine at 37.1", the method from the hypertech programmer manual gives me 35.3". i split the difference, but don't know if that's right. anybody know a better way?
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I'm only half joking here: Air up you tires the way you normally do; put a thin wet paint strip on the top of one tire tread perpendicular to the rotational direction of the tire; drive forward for about 15 feet and measure the distance on the pavement between the two paint marks; divide that number by Pi - 3.14 (3.14159265358979323846...). That's the effective diameter of your tire during act of driving. It's a little bit of a pain, but it's probably the most accurate way to do it.