How to Choose Tires for Your Car

Tires are the only part of your car that touches the road, so they affect braking, handling, comfort, noise and fuel use all at once. They are also a purchase many drivers make in a hurry, often when a garage says the old ones need replacing. Spending a little time understanding the options helps you buy tires that suit your driving and last as long as possible.

Know when to replace them

Tires need replacing when the tread is worn, when they are damaged, or when they are simply too old.

• Tread depth. Every country sets a legal minimum. Many tires have tread wear indicators, small raised bars in the grooves; when the tread is level with them, it is time to replace. Grip in wet conditions usually reduces well before the legal limit.
• Damage. Bulges, cuts, cracks in the sidewall or exposed cords mean the tire should be checked straight away.
• Age. Rubber ages even if the tread looks fine. The manufacture date is printed on the sidewall. Ask a tire professional how age affects your tires, and follow your car and tire manufacturer’s guidance.
• Uneven wear. Wear on one edge or in patches may point to alignment, pressure or suspension problems, which should be fixed before fitting new tires.

Read the size and markings

The sidewall carries a code describing the tire. A typical example looks like a width, a ratio, a construction letter and a rim diameter, followed by a load index and a speed rating.

• Width is the tire’s width in millimetres.
• Aspect ratio is the sidewall height as a percentage of the width.
• Construction is usually R for radial.
• Rim diameter is the wheel size in inches.
• Load index shows the maximum load each tire can carry.
• Speed rating is a letter indicating the maximum safe speed.

Your owner’s manual or the label inside the driver’s door frame lists the approved sizes and ratings. Stick to these unless a professional confirms an alternative is suitable. Fitting a lower load or speed rating than recommended can affect safety and may affect insurance.

Choose the right type

All-season tires

Designed to perform reasonably in a wide range of conditions, including light snow. A convenient choice in moderate climates, though they are a compromise compared with dedicated summer or winter tires.

Summer tires

Optimised for warm conditions, dry and wet. They usually offer sharper handling and shorter braking in warm weather but lose grip as temperatures drop and are not designed for snow or ice.

Winter tires

Made from compounds that stay flexible in the cold, with tread patterns designed for snow, slush and ice. In some regions, winter tires are required by law in certain months. If you use them, you will need somewhere to store your other set.

Performance and other types

There are also tires designed for performance cars, off-road driving, SUVs, light trucks and electric vehicles. Electric cars, in particular, may benefit from tires designed for their weight and torque, with lower rolling resistance and noise.

What to compare between tires

Once you know the size and type, compare a few models on:

1. Wet grip and braking. Often the most important safety factor.
2. Treadwear. Some regions use a treadwear rating or offer mileage warranties.
3. Rolling resistance. Lower resistance can improve fuel economy or electric range.
4. Noise. Some regions label external noise levels; reviews can tell you about cabin noise.
5. Comfort and handling.
6. Warranty. Check what it covers and how claims work.

Where tire labels are used, they offer a quick comparison of some of these factors. Independent tests and reviews give a fuller picture.

Questions to ask the tire shop

• Is the quoted price per tire or for the set, and does it include fitting, balancing, valves and disposal of old tires?
• Do you recommend replacing in pairs or all four?
• Should I have a wheel alignment check?
• How old are the tires in stock?
• What warranty comes with them?
• Is there a road hazard or puncture policy?

Replacing in pairs or sets

Ideally, all four tires should be the same model and similarly worn. If you replace only two, the usual advice is to fit the newer tires on the rear axle for stability, but follow the guidance for your vehicle. Four-wheel-drive and all-wheel-drive vehicles may need all four replaced together to avoid stressing the drivetrain. Check your manual.

Make them last

• Check pressures monthly and before long trips.
• Rotate tires as recommended to even out wear.
• Get alignment checked if the car pulls or after hitting a large pothole.
• Avoid harsh acceleration and braking.
• Do not overload the car.

Common mistakes

Buying the cheapest available without comparing wet grip.

Ignoring alignment problems that will wear new tires quickly.

Using the wrong size or rating.

Forgetting the spare, which can also age and lose pressure.

Mixing tire types across axles.

Choosing tires carefully is one of the most practical safety decisions you can make for your car, and a good set looked after properly will serve you well for many miles.