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Tire Calculators

Calculate tire dimensions

Enter tire diameter (inches) or fill out the fields below:
If a tire diameter is entered above, the tire dimensions fields
below will be ignored during calculation.

Treadwidth (mm):

Sidewall:

Rim diameter (inches):

Diameter:

Circumference:

Revolutions per mile:

 

Calculate engine RPM/vehicle speed and speedometer gear

Tire revolutions per mile:
If needed, use the tire dimensions calculator on the right to calculate this value

Final drive gear ratio:

Transmission drive gear ratio*:

Number of output shaft teeth1:

RPM:

MPH:

MPH:

RPM:

Number of teeth required on speedometer gear:

*Click to display a table of transmission gear ratios
194-97 MN12 and 93-98 FN10: 7, otherwise: 8

Compare tire dimensions

Stock Size

Diameter:
If a tire diameter is entered above, the tire dimensions fields
below will be ignored during calculation.

Treadwidth (mm):

Sidewall:

Rim diameter:

Size 2

Diameter:
If a tire diameter is entered above, the tire dimensions fields
below will be ignored during calculation.

Treadwidth (mm):

Sidewall:

Rim diameter:

Diameter:

Tire revolutions per mile:

If your speedometer says 60 MPH,
you are traveling 60 MPH
.

Diameter:

Tire revolutions per mile:

If your speedometer says 60 MPH,
you are traveling MPH.

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