UK tyre law requires all vehicle tyres to have a minimum tread depth of 1.6mm across the central three-quarters of the tyre width around the full circumference. Driving on a tyre below this limit is a criminal offence in the UK. Penalties in Cardiff are the same as anywhere in Wales and England — a fine of up to £2,500 and three penalty points on your driving licence per illegal tyre. Four illegal tyres therefore carries potential fines of £10,000 and 12 points — enough for an automatic disqualification.
Beyond tread depth, UK law also requires that tyres are suitable for the speed and load conditions of the vehicle, are free from significant cuts, lumps, bulges or exposed ply, and are inflated to the manufacturer's recommended pressure. Fitting tyres of the wrong size or speed rating for your vehicle is also illegal and could invalidate your car insurance in the event of a claim — the insurer will investigate whether defective tyres contributed to any accident.
Cardiff Police and DVSA (Driver and Vehicle Standards Agency) conduct regular roadside vehicle checks on South Wales roads. A tyre inspection can be triggered by any routine stop. Royal Mobile Tyres Cardiff strongly advises all Cardiff drivers to check their tyre tread depth monthly using the 20p coin test and to call 029 22714889 immediately if any concern arises. A mobile tyre inspection and replacement at your Cardiff home costs far less than a fine, points or an accident.