Tyre Size Calculators

This page contains all the tyre size calculators and converters that are spread amongst the Wheel & Tyre, all presented on a single page for quick reference.

The DOT Age Code Calculator:

This converter will turn your imperial tyre size into a metric tyre size:

Your imperial tyre size: X


Equivalent standard tyre size is : /100 R

Converting LT (Light Truck) imperial tyre sizes to metric:

Your LT tyre size: X R


Equivalent standard tyre size is : / R

Converting alpha numeric vintage tyre sizes to metric:

This calculator will convert alpha numeric vintage tyre sizes into the closest metric tyre size. Remember the section width is only a close approximations between old load and new size these days:
C = 185    D = 195    E = 205    F = 215    G = 225    H = 235 etc.

Your alphanumeric tyre size: R


Equivalent standard tyre size is: / R

Converting Michelin PAX tyre sizes to metric:

This calculator will convert Michelin PAX sizes into the closest metric tyre size.

Your PAX tyre size: / R


Standard tyre size is: / R

Comparing tyre sizes:

This calculator will help you to compare two different tyre sizes to see the differences in rolling circumference, and any speedometer difference error between the two sizes.

Current wheel/tyre New wheel/tyre
/ R / R
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Current rolling circumference
mm
New rolling circumference
mm
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Difference in circumference:mm or%
So when your speedo reads 70mph, you're actually travelling atmph

Comparing wheel offsets:

This calculator will help you to understand how changing your wheel offset will affect the wheel's position in relation to your suspension and bodywork.

Current wheel/tyre New wheel/tyre
Tyre Section: Wheel offset: Tyre Section: Wheel offset:

Calculating ideal rim width for any given tyre size:

This calculator will give you the ideal wheel rim size for any given tyre size.

Your tyre size: / R


Rim size is: X up to X

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