Tyres are the only part of your car that makes contact with the road, and the law takes tyre condition seriously. Driving on illegal tyres is one of the most common causes of serious road accidents in the UK, and the penalties are substantial. In 2026, this guide covers every aspect of UK tyre law that every driver needs to know.

Legal Minimum Tyre Depth

The legal minimum tread depth for cars in the UK is 1.6mm across the central three-quarters of the tyre's contact patch, around its entire circumference. This is not a recommendation — it is the law. Driving with tyres below this limit is illegal and carries significant penalties.

The 20p test is a practical way to check your tyre tread: insert a 20p coin into the tyre tread groove. If the border around the coin is visible, your tread may be below the legal limit and should be checked with a proper tread depth gauge.

Tyre-Related Penalties 2026

Driving on illegal tyres can result in:

  • Fixed Penalty Notice: GBP 2,500 and 3 penalty points per tyre — up to GBP 10,000 and 12 points if prosecuted
  • Vehicles can be immediately prohibited from continuing the journey: A police officer or VOSA inspector can issue a prohibition notice preventing the vehicle from being driven until the tyres are replaced
  • Insurance implications: Driving on illegal tyres may invalidate your insurance and result in personal liability for any accident

When to Replace Your Tyres

While the legal minimum is 1.6mm, most tyre specialists recommend replacing tyres at 2mm to 3mm in winter conditions, and at 3mm for summer driving. The reduction in braking distance between a tyre at 3mm and one at 1.6mm is significant — particularly in wet conditions where braking distances can double.

Warning signs that your tyres need replacing before reaching the legal minimum:

  • Tyres showing visible wear indicators — small bars across the tread grooves that appear when approaching 1.6mm
  • Cracks, bulges or cuts in the sidewall
  • Uneven wear patterns suggesting alignment or suspension issues
  • Vibration through the steering wheel at certain speeds
  • Age — tyres degrade over time even without significant mileage, and manufacturers recommend replacement at 5-10 years regardless of tread depth

Tyre Age — The Hidden Danger

Tyres degrade over time, even when unused. The rubber compound hardens and cracks, reducing grip. Most manufacturers recommend:

  • Maximum tyre age: 10 years from the date of manufacture, regardless of tread depth
  • Inspection recommended: After 5 years, annual inspection by a professional is advised
  • Replacement recommended: At 6-10 years for most normal-use tyres, depending on condition

The date of manufacture is printed on every tyre — look for the four-digit DOT code on the sidewall, indicating the week and year (for example, 0226 means the second week of 2026).

Tyre Types and UK Law

Summer Tyres

Standard summer tyres are legal in the UK year-round. They perform well in dry and wet conditions but their compound hardens significantly below 7 degrees Celsius, reducing grip.

Winter Tyres

Winter tyres are not legally required in the UK, but they are strongly recommended for drivers in Scotland, northern England and areas with significant winter weather. Winter tyres use a softer compound and different tread pattern specifically designed for cold, wet and icy conditions. They are marked with a snowflake symbol and the letters M+S (Mud and Snow).

In some European countries — including Germany, Austria and France — winter tyres are legally required in certain conditions during defined winter periods.

All-Season Tyres

All-season tyres carry both the snowflake and M+S markings and are legal in the UK year-round. They offer a compromise between summer and winter performance and are increasingly popular for UK drivers who experience occasional winter conditions without dedicated winter tyres.

Mixing Tyre Types

UK law does not prohibit mixing tyre types on a vehicle, but the Vehicle and Operator Services Agency (VOSA) advises that all four tyres should be of the same type, size and specification. Mixing summer and winter tyres on the same axle can create unpredictable handling characteristics and is strongly discouraged by tyre professionals.

Spare Tyres and Space Savers

Space-saver spare tyres — smaller spare wheels designed for temporary use — are designed for short distances at reduced speeds. They carry a maximum speed of 50mph and must be replaced with a full-size tyre as soon as possible. Space savers are not designed for extended motorway use and must not be used on the same axle as a standard tyre.

Many modern cars no longer carry a spare tyre, instead providing a tyre inflation kit ( sealant and compressor). These are designed for emergency puncture repair only and are not a substitute for a spare wheel.

Checking Your Tyres

Tyre pressure should be checked monthly and before long journeys. Under-inflated tyres:

  • Increase fuel consumption
  • Reduce braking performance
  • Cause uneven wear, particularly on the outer edges of the tyre
  • Risk sudden failure through overheating

Check tyre pressure when the tyres are cold and use the manufacturer's recommended pressure — found on a sticker inside the driver's door jamb and in the owner's manual.