It's very easy to forget about the condition and wear of tyres. The potential issues arising for neglecting tyres can not only lead to penalty points on your licence, but heavy fines in extreme circumstances.
There's also the increased possibility of an accident occurring due to insufficient tread depth, improper tyre pressures and blow-outs. Consequences can be serious if an accident is a result of badly maintained tyres.
This section explains the necessary safety and legal requirements that each vehicle driver should undertake to maintain their tyres.
Legal tyre tread depth
For passenger vehicles excluding motorcycles and vehicles not fitted with more than 8 seats. Goods vehicles that do not exceed a maximum of 3500 kg gross weight and trailers that do not exceed 3500 kg maximum gross weight, the minimum legal tyre tread depth limit must be:
- 1.6 mm tread depth
- 1.6 mm across 75% of the width of the tyre
- 1.6 mm around the entire circumference of the tyre
For other vehicles larger than those listed above and for motorcycles of 50cc and over, the minimum legal tyre tread depth must be:
- a continuous band of 1 mm tread depth
- 1 mm across a minimum of 75% width of the tyre and around the entire circumference
Tyre tread law
The law with defective tyre offences and / or insufficient tread depth can be severe depending on the circumstances.
Tyre Tread Depth
If a tyre is inspected by a police officer and found to have a tread depth not within the legal limits, they may issue a Fixed Penalty Notice. The tyre fixed penalty is £60 and 3 points on your driving licence. Providing you pay within the date on the fixed penalty notice, no court action will be necessary.
It is the police officers discretion that determines whether a Fixed Penalty Notice is issued or for more serious violations, the officer may wish to prosecute.
The maximum fine that a court can impose is £2500 per tyre and 3 penalty points.
These are the possible offences that can relate to illegal tyres currently fitted to a vehicle:
- Tyre tread depth must comply with the legal requirements outset above
- Use of cross-ply and radial tyres must be used correctly
- Cuts, bulges and tears may deem a tyre illegal
- Over or under inflated tyres making the vehicle unstable or at risk of a tyre blow-out
- Exposed tyre ply or cord around any part of the tyre
- Illegal tyres and car insurance
The least of your concerns are if you get caught by the police if driving on illegal tyres. If you have an accident that is your fault and an inspection concludes that one or more of your vehicles tyres are illegal, it is highly likely that your car insurance will become invalid.
It isn't a legal requirement to carry a spare tyre and the condition of the tyre has no consequence while it remains a spare. Once fitted however, it must abide by UK laws.
Before checking the condition of your tyres, ensure you are on a flat surface, with plenty of distance from curbs, the car is turned off and safely secured with the parking brake.
Tyre tread depth gauges are cheap to purchase and can be found in most car equipment and service stores.
Ensure the tyre has a minimum of 1.6 mm of tread depth across at least 75% of the central width of the tyre and around the entire circumference.
Tyre tread markers are available on most tyres as illustrated in the diagram. When the tyre tread becomes level with the markers, the tyre is at its minimum legal limit. Whilst performing the tyre check, ensure there are no deep cuts on the sidewalls and no bulges.
The correct tyre pressure for your vehicle can be found inside your vehicle hand book and should be done whilst the tyres are cold.
Two tyre pressure are often quoted, one for normal use and another for heavy load. If you no longer have the vehicles hand book, the vehicles manufacturer is able to provide you with this information as will a tyre replacement garage.
Under or over tyre inflation not only increases tyre wear but can affect the grip and braking of the vehicle. Under inflated tyres can potentially lead to overheating and possible break down of the tyre. Fuel usage is also increased by under inflated tyres.
Ideally a quick visual check of each tyre should be made every day before a journey. It's possible to sustain a slow puncture that may only become evident over a few days.
Generally the more mileage you do, the more damage your tyres can potentially sustain and the faster the will wear. Opting for cheap tyres can lead to faster tyre wear and the way you drive can also have an impact.
On average however, a more thorough check of the tyres, including tyre pressure, legal tread depth and damage should be checked at least once every month.
Tyres and the MOT
The 15 point check of a car MOT includes the tyres. The spare tyre is not included in the check. The inspection covers the legal condition, security, tyre size and type and tyre tread depth. Tyres that fail to meet the minimum legal requirements will not have an MOT certificate granted for the vehicle.