AGCO Automotive Tire Speed Calculator
Default entries are for example only and should be typed over
Example 265/70R17
265=Tire Width     70=Aspect Ratio     17=Rim Diameter
Enter Original Size Tire Enter Alternate Size Tire
Tire Width in (mm) Tire Width in (mm)
Aspect Ratio
Aspect Ratio
Rim Diameter in (inches) Rim Diameter in (inches)
Foundation Speedometer Reading MPH

Calculated Comparison Results

Original Tire Alternate After Market Tire
Side Wall Height (inches) Side Wall Height (inches)
Tire Width (inches) Tire Width (inches)
Tire Diameter (inches) Tire Diameter (inches)
Tire+Wheel Radius (inches) Tire+Wheel Radius (inches)
Tire Circumference (inches) Tire Circumference (inches)
Tire Circumference (inches) % Difference
Revolutions per mile Revolutions per mile
Revolutions per kilometer Revolutions per kilometer
When actually driving (MPH) The speedometer will read (MPH)