Ensuring your tyres meet legal requirements is essential for safety, avoiding fines, and maintaining valid insurance. UK tyre law is straightforward but strictly enforced, with serious consequences for non-compliance.
Legal tread depth requirements: The minimum legal tread depth is 1.6mm across the central three-quarters of the tyre width and around the entire circumference. However, safety experts recommend replacement at 3mm for optimal wet weather performance.
How to check tread depth:
- 20p coin test: Insert a 20p coin into the tread groove - if the outer band is visible, the tyre is at or below 1.6mm
- Tread depth gauge: Use a proper gauge for accurate measurement
- Wear indicators: Modern tyres have built-in wear bars at 1.6mm
- Professional check: MOT centres and tyre retailers offer free checks
Other legal requirements:
- No cuts or bulges in the sidewall
- No exposed cords or ply
- Proper inflation - significantly under or over-inflated tyres can fail inspection
- Appropriate tyre type for vehicle (no temporary tyres for permanent use)
- Matching construction types on same axle
Penalties for illegal tyres:
- Fine: Up to £2,500 per tyre
- Penalty points: 3 points per tyre on driving licence
- Maximum potential: £10,000 fine and 12 points for all four tyres
- Insurance implications: Claims may be refused with illegal tyres
- MOT failure: Automatic failure with consequences
Mixed tyre types - legal considerations:
- Radial and cross-ply tyres cannot be mixed on the same axle
- Different tread patterns allowed but not recommended
- Run-flat and conventional tyres shouldn't be mixed
- Winter and summer tyres can be mixed legally but isn't advisable
Speed and load ratings: Tyres must meet or exceed the vehicle manufacturer's specifications for speed and load ratings. Using lower-rated tyres is illegal and dangerous.
Regular inspection routine:
- Check tyre condition monthly
- Monitor pressure levels regularly
- Look for unusual wear patterns
- Inspect for damage after impacts or punctures
- Professional inspection at least annually
Age considerations: While not strictly illegal, tyres over 10 years old are considered unsafe regardless of tread depth and may fail professional inspections.
Commercial vehicle requirements: Commercial vehicles have additional requirements including more frequent inspections and different minimum tread depths for certain axles.
At tyres.online, all tyres from our partner retailers meet UK legal requirements and safety standards. Our platform helps you understand specifications and choose tyres that not only meet legal minimums but provide optimal safety margins for your driving needs.