Quote:
Originally Posted by MTAS
Why would it be such a drastic difference from the manufacturer's site?
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Because wrapping a tape measure around the tire and dividing that into the measured mile is NOT the correct way to calculate the tire revs per mile. A tire's contact patch will throw off the calculation, so you have to use the manufacturer's published number. If the tire company doesn't publish a number for your particular tire, then you are better off using the number from a different company for the same size tire (not the best choice, but better than guessing).
Using 157db's method will result in your speedo being off. But here's the question - If the correct number is 770, but you plug in 740 into your handheld tuner, will be speedo be reading faster or slower than you are actually traveling? I know the answer, but I just wanted to give you something to think about this morning.
