When I calculate revs per mile I get a number that is consistently 3%below published numbers. For example 215-70-R15 with diameter 26.8". I divide 63,360 (number of inches in a mile) by 84.195 (tire circumference in inches, 26.8*pi) and get 752.5 revs per mile. But all the published specs I've seen show about 775 revs per mile. What am I missing in the calculation?
Also, I have seen revs per mile given at a particular speed (45 mph). What does the speed have to do with it, since revs per mile doesn't have an element of time in it?
Steve
Also, I have seen revs per mile given at a particular speed (45 mph). What does the speed have to do with it, since revs per mile doesn't have an element of time in it?
Steve
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