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SVT Shelby GT500
Upgrade my 2012 Transmission or Gears For 65mph performance?
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<blockquote data-quote="Catmonkey" data-source="post: 14987753" data-attributes="member: 124025"><p>Snoopy, it doesn't matter if it's using the circumference of the stated tire diameter. The reason using the inflated tire diameter is flawed is because the unloaded radius will travel further than the loaded radius given a full tire rotation. My Michelin's have tire revolution per mile of 726. In other words, given real world conditions with the full weight of a car on the tire, the tire will rotate 726 times over the course of a mile. One mile in inches is 63,360". The circumference of the unloaded tire diameter of 28.7" is 90.16". That means the tire revolutions per mile would be 702 (63,360/90.16), which doesn't agree to Michelin's published data. </p><p></p><p>To get accurate results in these online calculators, it would be better to back into the circumference by the dividing 63,360 by the published revs per mile. In the case of the Michelin 315/35-20: 63,360/726=87.27. Divide 87.27 by pi and you get 27.78. Put that number into the online calculator and you'll get more accurate results.</p></blockquote><p></p>
[QUOTE="Catmonkey, post: 14987753, member: 124025"] Snoopy, it doesn't matter if it's using the circumference of the stated tire diameter. The reason using the inflated tire diameter is flawed is because the unloaded radius will travel further than the loaded radius given a full tire rotation. My Michelin's have tire revolution per mile of 726. In other words, given real world conditions with the full weight of a car on the tire, the tire will rotate 726 times over the course of a mile. One mile in inches is 63,360". The circumference of the unloaded tire diameter of 28.7" is 90.16". That means the tire revolutions per mile would be 702 (63,360/90.16), which doesn't agree to Michelin's published data. To get accurate results in these online calculators, it would be better to back into the circumference by the dividing 63,360 by the published revs per mile. In the case of the Michelin 315/35-20: 63,360/726=87.27. Divide 87.27 by pi and you get 27.78. Put that number into the online calculator and you'll get more accurate results. [/QUOTE]
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SVT Shelby GT500
Upgrade my 2012 Transmission or Gears For 65mph performance?
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