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Tire diameter



Hi group,
  Tire diameter is easy: 

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

tire width in mm
2540 changes mm & ar to inches

stock tire 205x60-15	td = ((205*60*2) / 2540) + 15 = 24.685 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.  

MIKE
'89 200q