You can find the width, profile, wheel size and speed rating information on the side of your existing tyre. The diagram below shows where to find the size and speed rating of your tyre.

Width

Width is the measurement of the lateral flat part of the tread

Profile

The ratio of the sidewall to the width of the tyre tread. Expressed as a percentage ie.        a tyre of 220mm width with a sidewall height of 110mm would be a 50 profile tyre

Wheel Size

Wheel Size is the actual diameter of the wheel. This is usually measured in inches however, as few vehicles manufacturers

Speed Rating

The maximum continuous speed the tyre is rated for. (See Reading Your Tyre)