tire calculations

[Roger Pettigrew <dodger7998@xxxxxxx>]

Does this sound about right,,,,,,, 
 
4300 divided by 3.23 = 1331 tire revolutions per min.
 
70 mph = 1.16 miles per minute
 
1.16 miles per minute  = 73498  inches per minute of tire  travel
 
73498 divided by 1331 tire revs. = 55.2 tire circumference 
 
55.2 divided by 3.14 = 17.58 inch tall tire,,,,,,, 
 
If your tires are taller than this,,,,,,,, your tach is  off,,,,,,,,

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