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	Tire Diameter Calculation ...with this tool you can compare and calculate the difference between your original and optional tire size. It shows you all relevant data as: diameter, circumference, tachometer variation etc. You also can compare a metric 315/75 R17 tire with inch 35x12,5" tire. Tire - original   Tire - optional    Tire - metric: / R  Tire - metric: / R  Tire - inch:  Tire - inch: Result:   Result:   Diameter: Diameter: Circumference: Circumference:   Circumference difference:       Tachometer variation:   Tachometer reading:   Original - 50 km/h   Original - 100 km/h   Original - 150 km/h   Original - 200 km/h   Original - 250 km/h   Calculation: ( Rim diameter in inch * 25,4 ) + (( Tire width / 100 * Tire hight ) * 2 ) = Diameter in millimeters