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Tire Size


tps0424

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I have noticed that my speedometer is off about 12% since I got my Wester's PCM. Not in the way you normally think of when you get larger tires, exactly the opposite. When the speedo indicates 25, I'm actually going 22. I'm putting on miles faster than I should be.

I mentioned this to Lyndon and he had me measure the circumference of the tire, from there he calculates the tire height. I told him that I got 98 7/8". He figured that out to be 31.47" tall. He was expecting it to be 32.7 on a 285/70/17 tire. 32.9 is what the Goodyear website says it should be.

Why are my tires so much smaller than they should be? I seem to have lost an inch and a half. Has anyone else measured their circumference?

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