It is no wonder that people get confused about tyre sizes when they are a mixture of
metric, imperial and percentage measurements.
In the diagram opposite the width of the tyre is 205mm from sidewall to sidewall. The diameter of the wheel rim is 14" and the height of the tyre from the top of the Wheel to the top of the tyre (often called the profile) is 70% of the width of the tyre.
When converting to low profile performance tyres from standard tyres, it is important to remember that the overall height of the tyre must remain similar or else the circumference will change and alter the speedo and mileage readings. To achieve this, the wheel diameter must be increased to allow the profile to be decreased. i.e to change to a 60% profile on the example shown a 15” wheel would be required, and the tyre size would be 205/60x15
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