Skip to content

Understanding tyre codes

Ever wondered how much air your tyres need or what letters and numbers on each tyre are there for? Tyre markings come in a mix of letters indicating tyre specifications and tyre inflation pressures for your vehicle. You’ll find the markings on both sides of the tyre – usually referred to as the tyre’s ‘sidewall’. Our experts help you understand the tyre codes on your vehicle.


‘A’ (see graph) refers to the brand, make and model of the tyre.

These three numbers show the tyre width in millimetres. This is the total inflated width at its widest point (excluding sidewall ribs and lettering). The ‘P’ indicates this is a passenger car tyre.

This number shows the height of the tyre as a percentage of the section width (B). This P205/60 tyre shows the section width is 205mm and the height is 60 per cent of that. The lower this number, the lower the tyre profile.

‘D’ refers to the type of construction. R stands for radial, B for Bias.

‘E’ represents the rim diameter which fits the tyre. This measurement is always in inches.

‘F’ is checked against a chart to identify the maximum load the tyre can carry at the speed indicated.

This letter represents the maximum safety speed. Passenger tyre speed ratings start at N (140km/h) and go to Y (300km/h).

Noel’s Progress Road Pitstop – the tyre experts
Need new tyres for your car or 4WD? Our Wacol workshop at Noel’s Progress Road Pitstop is home to the best tyres in Brisabane, suitable for many makes and models.

Some of the leading tyre brands we sell include:

Find out more about Noel’s Progress Road Pitstop tyres here.

Noel’s Progress Road Pitstop – experience counts
With more than 30 years’ experience in the industry, the technicians Noel’s Progress Road Pitstop are here to assist with all your mechanical needs. Not only do we provide servicing and repairs, but we also stock a vast range of parts and products, including tyres, mag wheels, rims and more. Located in Wacol, our state-of-the-art workshop welcomes vehicles of all makes and models.

For top brands in Brisbane – at affordable prices – call Noel’s Progress Road Pitstop on 07 3271 1509 or visit our website.


How To Read Car Tyre Markings On Tyre Sidewalls | RAC WA

Tyre information (Department of Transport and Main Roads) (

Scroll To Top