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Note: results are round up and are approximate only. Variations in construction and manufacturing vary from supplier to supplier.

To use this program you need to key in seven (7) pieces of information (BLUE FIELDS). The tire tread width, sidewall ratio, and wheel rim diameter from each of the two tires to be compared and a speedometer reading to be used to compute the effect the after market tire size has on your speedometer.

Please select from one of the two choices below:

 

U.S. (English) Tire SIZES
Enter information for Fields Labeled in BLUE
Original Equipment Tire Alternate After Market Tire
Tire Width in (mm): Tire Width in (mm):

Aspect Ratio:

Aspect Ratio:
Rim Diameter in (inch): Rim Diameter in (inch):
Speedometer Reading:
Original Equipment Tire Alternate After Market Tire
Side Wall Height (inch): Side Wall Height (inch):
Tire Width (inch): Tire Width (inch):
Tire Diameter (inch): Tire Diameter (inch):
Tire+Wheel Radius (inch): Tire+Wheel Radius (inch):
Tire Circumference (inch): Tire Circumference (inch):
% Difference:
Revolutions per mile: Revolutions per mile:
Revolutions per kilometer: Revolutions per kilometer:
Speedometer Reading: New Speedometer Reading:


 

Metric (TRX) Tires Sizes

Original Equipment Tire Alternate After Market Tire
Tire Width in (mm): Tire Width in (mm):

Aspect Ratio: 		Aspect Ratio:
Rim Diameter in (mm): Rim Diameter in (mm):
Speedometer Reading:

Original Equipment Tire Alternate After Market Tire
Side Wall Height (mm): Side Wall Height (mm):
Tire Width (mm): Tire Width (mm):
Tire Diameter (mm): Tire Diameter (mm):
Tire+Wheel Radius (mm): Tire+Wheel Radius (mm):
Tire Circumference (mm): Tire Circumference (mm):
% Difference:
Revolutions per mile: Revolutions per mile:
Revolutions per kilometer: Revolutions per kilometer:
Speedometer Reading: New Speedometer Reading:

 

 

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