Do the math! But is it right?? - Saab General Bulletin Board - Saabnet.com
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Do the math! But is it right??
Posted by Noel [Email] (more from Noel) on Fri, 8 Oct 2010 06:27:25
In Reply to: Re: Fuzzy math?, JimBlake [Profile/Gallery]
, Thu, 7 Oct 2010 19:57:16
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In my post above I did the math and it works out to agree with the Miata tire calculator:
The diameter of a 215/55 x 16 is 25.3" and the circumference is 79.5"
25.3" x Pi = 79.5"
This works out to 797 revolutions per mile: 5280 ft x 12" = 63,360"/79.5" = 797 revs/mile.
What Tim is questioning is why tire specs for this size tire all show about 823 revolutions per mile which would mean the tire has a circumference of about 77" and a diameter of 24.5"
I'm terrible at math, but I think these numbers are right. It just doesn't make sense unless the dimensions of the tire are incorrect to begin with. I haven't physically measured the tires on our 9-5 so I don't know for sure.
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