How to read your tyre size
Knowing your tyre size makes the selection of your next tyres much simpler. The tyre size can be found on the sidewall of your tyre. Look for the manufacturer’s name on the tyre (e.g. Bridgestone). You will see a set of numbers and letters that signify the size of the tyre (195/ 50 R 15).
195 is the width of the tyre in millimetres.
50 is the aspect ratio or tyre profile.
R means it is radial construction (common in most passenger tyres)
15 is the diameter of the wheel rim in inches.
What’s a tyre’s profile?
This is the ‘height’ from the bottom of the tread to the rim, and the number represents a percentage of the tread width. Our tyre example (195/50R15) has a profile or sidewall that is 50% of the 195mm (width). Low profile tyres have smaller aspect ratio percentages.