Speedometer Information

# Drive Teeth X Axle Ratio X Tire Rev. per Mile = # Driven Teeth
1001

Use the following formula to calculate the Tire Rev. per Mile for the above formula.
Tire Rev. per Mile = .             20168             .
Tire Diameter (inches)

Try this handy custom calculator. It will do all the work for you. If you don't know your tire diameter, calculate it below using the P-metric sidewall designation.

# of Drive Teeth:
Axle Ratio:
Tire Diameter: 		# of Driven Teeth:

 

Tire Diameter Calculator  
Tire Width
(mm)		 Aspect Ratio
(1-100)		 Wheel Diameter
(in)		   Tire Diameter
(in)
 
Enter the tire width in millimeters, the aspect ratio, the wheel diameter in inches, and
Click on Calculate...