Tyre Law for Trucks and Vans: The Rules Explained

Tyres are the only part of the vehicle that touches the road, and the law treats them accordingly: per-tyre penalties, prohibition powers and, for heavy vehicles, an age limit that surprises people who have not kept up. Here is UK tyre law for trucks, vans and trailers in plain terms, and the checks that keep you on the right side of it.

Legal tread depths are not the same for everyone

• Cars, vans and light trailers up to 3.5 tonnes: at least 1.6 mm across the central three quarters of the tread, around the entire circumference.
• Goods vehicles over 3.5 tonnes: at least 1 mm across three quarters of the breadth and around the whole circumference, with the base of the original grooves still visible on the rest.

Those are floors, not targets. Wet grip decays long before the legal minimum, which is why well-run fleets pull tyres early and why our guide to reducing fleet tyre costs treats early rotation as an investment rather than a waste.

The 10-year age rule for heavy vehicles

Since 2021 it has been illegal for tyres more than ten years old to be fitted to the front steered axles of HGVs, buses and coaches, or on any axle of a minibus in single-wheel configuration. The date code on the sidewall, the last four digits of the DOT marking showing week and year of manufacture, is now a compliance item, and it must be legible. Aged casings on rears and trailers remain legal in some positions but deserve scrutiny: rubber hardens with age regardless of tread remaining.

Condition rules beyond depth

The law also prohibits cuts longer than 25 mm or 10 per cent of section width deep enough to reach cord, lumps, bulges, exposed ply and cord, and tyres unsuitable for the load or speed of the vehicle. Under-inflation is the silent one: it overheats casings, invites blowouts and can render a tyre unfit in law even with perfect tread. For twin-wheel assemblies, debris trapped between tyres and mismatched pressures are classic inspection findings.

What it costs to get wrong

Defective tyres carry a fine of up to £2,500 and three penalty points per tyre for the driver, so one neglected axle can end a licence in a single stop. For operators, tyre defects found at the roadside bring prohibitions, feed straight into the OCRS score and are treated by Traffic Commissioners as a maintenance system failure, not bad luck. Tyres are checked at every annual test and are a staple of DVSA roadside checks.

The routine that keeps you legal

Tread, pressure, sidewalls, valve caps, between the twins: that is the daily walkaround portion. Behind it sit torque checks after wheel removal, pressure maintenance on a schedule, date-code audits for the age rule, and a policy on regrooving, which is legal and normal on truck tyres marked regroovable but illegal on car and most van tyres. Write the standards down, and the fleet’s tyres stop being a lottery.

Bringing it together

1.6 mm for vans, 1 mm for heavies, ten years maximum on steered axles, and zero tolerance for cord, bulges and cuts: the rules are clear and the penalties are per tyre. Build tyres into daily checks and planned maintenance and the law becomes irrelevant because you are always inside it. For more guides to keeping vehicles earning and compliant, browse Insights from Life Internet Services, home of TrucksLife and TrailersLife.

Frequently asked questions

What is the legal tread depth for an HGV?

1 mm across three quarters of the tread breadth around the entire circumference, with the base of the original grooves visible on the remainder. Vans and trailers up to 3.5 tonnes follow the car standard of 1.6 mm across the central three quarters.

What is the penalty for an illegal tyre?

Up to £2,500 and three penalty points per defective tyre, alongside possible prohibitions for the vehicle. Four illegal tyres can therefore mean £10,000 in fines and enough points to end a driving career, plus serious consequences for the operator’s compliance record.

Are 10-year-old tyres illegal on trucks?

On the front steered axles of HGVs, buses and coaches, yes, and on any axle of single-wheel minibuses. The manufacture date comes from the four-digit week and year code on the sidewall, which must remain legible. Older casings elsewhere are not automatically illegal but warrant close inspection.