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Re: Tire diameter

   Hi group,
     Tire diameter is easy: 

	  td = ((tire width*aspect ratio*2) / 2540) + wheel dia in inches

   circumference = td * pi				77.55
   circ (in feet) = circumference / 12		 6.4625
   wheel revolution/ mile = 5280 / circ 	       817.021 	

   anybody with programming abilities can make a small program in qbasic, c
   or whatever to automatically check out any tire size, and how that
   tire/wheel combo will be to stock.  

However, bear in mind that there can be a *lot* of variation from
brand and model to another model and brand. It's more or less what-
ever the manufacturer wants to call it.

As I recall, it was Yokohama A-001Rs that were about half-an-inch
bigger diameter, and actually rubbed (ever so slightly, mostly just
"kissing") the inside fender well . . . so don't place *too* much
faith in idealistic calculations. (In particular, calculating to
4 decimal places is hopelessly optimistic)

					-RDH