Tire measurement tool

Use our tire size calculator to calculate the diameter, width, sidewall, circumference, and revolutions per mile of any tire. Just type in a metric or standard size tire and click calculate. Inch measurement tires are fairly easy to understand however metric tires use a more difficult system to read.

The first number on a metric tire is the width in millimeters. Divide this number by The third number generally preceded by an "R" is the wheel diameter. The sidewall or aspect ratio are used in metric tire sizes to determine the overall height of a tire. The second number on a metric tire is to calculate the side wall measurement.

The sidewall height is a percentage of the width of the tire. This second number is that percent. Our tire calculator makes this happen for you. Just type in any tire size and click calculate. It also solves the problem of deciding what tire you would like to run if you have inch tire measurement in mind but can't find a company that manufactures that inch tire size.

Just fill in the inch measurements you are looking for and it will populate suggested tire sizes that are with in one inch bigger and smaller of the entered inch tire size. There are more possibilities and choices in metric tires so the use of a tire size calculator can be very useful. The tire size comparison calculator takes the measurements of two tires and compares the diameter, width, sidewall, circumference, and revolutions per mile.

Then as a bonus it shows examples of your speedometer reading with the first tire, and the actual speed you're traveling if you were to install the second tire. A very useful tire calculator when searching for tires that are a different size than stock.

Another tire size calculator we have is our speedometer correction calculator. This is valuable if you plan to or are already running bigger tires than stock, and want to know the speed you are actually traveling compared to you're speedometer reading.

A bigger tire has a larger circumference, thus traveling a further distance for each revolution. A speedometer reads the amount of revolutions your tires are making, not how far you are traveling. Therefore you are actually traveling faster than your speedometer says when you have larger tires than stock, and slower than you're speedometer says if you have smaller tires.

We are now backordered. Please call us to be put on backorder list for mid-March delivery. Made in USA. For over 20 years, the Wheel Fit has been the pinnacle wheel fitment tool in the world. Using 3 points of contact, this is the ultimate in gripping power to hold most any tire bead completely round for the most accurate test fit possible. We have 2 versions of each faceplate. This system fits most all 5-lug and 6-lug vehicles from mmmm bolt circle.

This upgrade fits most all 4, 5 and 6-lug vehicles from 98mm - mm bolt circle. This system fits most all 4-, 5-, 6- and 8-lug vehicles from 98mmmm bolt circle.