Tyre size calculators
The DOT Age Code Calculator
The calculation built in to this page is up-to-date based on today's date. If the DOT age code on your tyres is older than this code, change your tyres.
DOT AGE CODE:
Converting classic / vintage / imperial crossply tyre sizes to metric
This converter will turn your imperial tyre size into a metric tyre size:
Converting LT (Light Truck) imperial tyre sizes to metric
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.
Converting Michelin PAX tyre sizes to metric
This calculator will convert Michelin PAX sizes into the closest metric tyre size.
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.
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.
Calculating ideal rim width for any given tyre size
This calculator will give you the ideal wheel rim size for any given tyre size.