Quote:
Originally Posted by mothertrucker424
what do you mean by rolling diameter as in 285 or 32" tall
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Rev’s per mile at 45 MPH is what I mean by rolling diameter. For example, a 285/75R16 has an overall diameter of around 33” but the Rev’s per mile (and what the ECM needs to know) is 630. There is a mathematical method of converting a tire size to rolling diameter but I cannot remember how it goes, so.....let's take BFG’s word for it…. Check this out and it will make more sense.
http://www.bfgoodrichtires.com/specs...t-a-ko/44.html