Tyre Law
UK tyre law sets minimum standards for tyre condition, tread depth and general road safety. This guide explains the main legal points drivers should know to keep tyres safe and road legal.
UK tyre law requires tyres to be in a safe and roadworthy condition. The rules cover areas such as minimum tread depth, damage, unsuitable tyre use and correct use on different vehicles.
Official guidance recommends checking tyres for tread depth, cuts, bulges, embedded objects and any other visible damage. If in doubt about the condition of a tyre, it should be assessed and replaced if necessary.
Failing to maintain tyres in a legal condition can lead to penalties, points on your licence or more serious safety risks on the road.
Main tyre law requirements
These are some of the most important tyre law areas drivers should understand.
Tyre Mixing
Drivers must not have radial tyres on the front wheels and cross-ply tyres on the rear wheels. It is also illegal to have a cross-ply tyre on one side of an axle and a radial on the other.
Unsuitable Tyres
All tyres must have a service description, load index and speed rating suitable for the vehicle. Using unsuitable tyres can make the vehicle unsafe and potentially illegal.
Tyre Cuts
A cut larger than a legal limit or deep enough to reach the ply or cord can make a tyre illegal and unsafe to use.
Ply or Cord Exposure
If the ply or cord of the tyre is visible through the rubber, the tyre is illegal regardless of how small the exposed area may appear.
Lumps, Tears and Bulges
Bulges, tears or lumps in a tyre can indicate structural damage. These issues can weaken the tyre and should be checked immediately.
Tread Depth
The legal minimum tread depth for most passenger vehicles is 1.6mm across the central three quarters of the tyre and around the full circumference.
Tread depth rules
Standard vehicles
The legal minimum tread depth for cars, vans, 4x4s, light trailers and similar vehicles is 1.6mm across the central three quarters of the tread, around the full circumference.
This rule applies to most everyday passenger vehicles and is one of the most commonly checked legal tyre requirements.
Heavy vehicles and motorcycles
Different rules may apply to heavier vehicles and some motorcycles depending on design and vehicle class. If you are unsure, always check the correct legal requirements for your vehicle type.
Running tyres below the legal tread depth can affect grip, braking and road safety, particularly in wet conditions.
Other points to remember
Temporary use tyres
All temporary or space-saver tyres must be used only within their intended limits. Many are restricted to lower maximum speeds and are not designed for long-term use.
Re-grooved tyres
Re-grooved tyres are not legal on many passenger or utility vehicles below certain weight limits. Always make sure tyres fitted to your vehicle are suitable and legally compliant.
Driving abroad
Tread depth and tyre rules may vary between countries. If you are driving abroad, it is important to check the tyre laws of the countries you will be visiting or driving through.
Different countries may have different legal requirements for tread depth, speed ratings, snow or winter tyres and equipment carried in the vehicle.
Tips for safety when driving abroad
Before you travel
- Inspect all tyres, including the spare, for signs of damage
- Make sure tread depth is legal for each country on your route
- Check tyre pressures before a long journey
- Ensure tyres are suitable for the load you are carrying
During the journey
- Inspect tyres during rest stops if travelling long distances
- Look for uneven wear, cuts or bulges
- Avoid driving on damaged tyres
- Check whether your vehicle requires additional legal equipment abroad
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