What Tyre Size Fits My Car? A Guide for Purchase

Section Width

The measurement of the width of a tyre from its side wall (inner) to the other sidewall (outer) is called the 'section width' or sometimes the 'cross section width'

Some points to consider:

• Unit of measurement is millimetres.

• The measurement excludes any protective ribs or raised letters.

• The rim’s width influences the tyre’s width. So, appropriate industry assigned rims should always be used.

Aspect ratio

The ratio of tyre’s width with the height of its cross section gives this aspect ratio or tyre’s profile. In above example, 60 denote that tyre’s height is equal to 60% of its width. Hence, lower the aspect ratio, the wider the width.

Note: Tyres with a lower aspect ratio (below 60) are high performing. The reason is low aspect ratio gives better stability for lateral forces. Also, with short and stiff sidewalls, cornering forces are resisted.

Construction Type

As shown in the example above, R refers to Radial. It is a tyre design where cord plies are arranged radially from the centre of the tyre at 90 degrees.

Rim Diameter

The rim is the frame that holds the tyre. Rim diameter is the distance of the rim from bead to bead. Its measuring unit is inches. The typical size range is between 12 inch to 28 inch – mainly 15”, 16” and 17”.

Load Index

Load index or load ratings denotes the maximum load that a tyre can take when properly inflated. The manufacturer can best guide to what capacity will be suitable for your car.

A load index table is available here

Speed rating

This indicates the speed a tyre can safely be driven with the specified maximum load of the tyre. The tyre’s speed rating is in letters.

A complete speed rating table is available here.

If you are unsure about the tyre size, you can also get these specifications in your owner’s manual.

Where to buy?

Read the markings on your current tyre carefully; make sure to double check.

Buy tyres online with our quick and easy tyre finder. Simply enter your car reg and that's it! Else, you can also decide on your brand and put in your tyre specifications – width, profile, rim, speed, postcode, etc.

Choosing the Right Tyre Made Easy

When it comes to your car's safety and performance, tyres can play a huge role. That's why we've put together a collection of helpful articles to guide you through the process of selecting the perfect tyres for your ride and maintaining your vehicle in general.

If you're looking for a smoother, more luxurious driving experience, premium car tyres might be the way to go. Or, if you want added security against flats, run flat car tyres could be your best bet. Trying to decide between summer car tyres and winter car tyres? We've got you covered there, too.

We also dive into the world of tyre brands, comparing top manufacturers like BF Goodrich tyres, Bridgestone tyres, Continental tyres, Dunlop tyres, Falken tyres, General tyres, Goodyear tyres, GT Radial tyres , Hankook tyres, Michelin tyres, Pirelli tyres, Runway tyres, Sumitomo tyres, and Toyo tyres.

But we don't just stop at helping you choose the right tyres – we also share tips on how to keep them in tip-top shape. From checking your tread depth and keeping your tyres properly inflated to extending their life through regular rotation and balancing, our articles have got you covered.

So, whether you're a car enthusiast or just looking to keep your vehicle safe and reliable, our car help and advice articles are here to help you make informed decisions about your tyres. Check them out and feel confident in your tyre choices!