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Say what? Whew! Boy that's the last time I attempt any math stuff.
Seriously, I disagree that a tire that is one full inch shorter, will not have to turn twenty-five more times per/mile. You said it was not linear as I thought, but then went on to come to about the same calculations as I did. Go figure. If a tire that is 1/10th of an inch shorter turns two and a half times more then the math is correct. I will double check this one. Actually, I got this information from a tire mfr. who gave me the number of revolutions per mile for the various sizes. It was never my intent to cover all aspects of this, but just one small point. Of course there are other factors.
Btw, Les I never said what the aspect ratio is. I still don't know. I was only figuring this all out from the overall diameter, which is all I wanted to know.
Les: "You kind of lost me in this paragraph. Here are my thoughts: "
Reply: Again, I got this information from a tire mfr. who gave me the number of revolutions per mile for the various sizes. I simply multiplied the revolutions for one mile times 30 miles (or how far CR and the EPA says it can go on a tankful of highway driving), then I multiplied that by 15 gallons (roughly what a tank holds - yes, I know it holds 15.8 gals). So that will give a total close number of revs for a tank of gas - mathematically. Then I compared the revs for the two tire sizes on a tankful and subtracted one from the other to see what the difference was. This is odd. I went thru this with a few of the tire mfrs tech guys and we all got the same answer - now you come along and say this is all wrong. Hey, I'm no Einstein, but I know what common sense is. I think your math formulas are wrong, but your numbers are right. And that's what you said to me too, essentially. So how are we both getting the same numbers and both using two different formulas. Betcha mine is quicker.
No flaming intended.
Rob
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