Rubber hardens and cracks with age, reducing grip.
Tyres have a date code on the sidewall.
Reading the date code
Look for a four-digit code after “DOT” on the sidewall. The first two digits are the week, and the last two the year. For example, 2422 means the 24th week of 2022.
How old is too old?
Many manufacturers recommend inspection after five years and replacement after around ten years regardless of tread. Check your vehicle and tyre maker guidance.
Signs of ageing
- ▸Cracks in sidewalls or between treads
- ▸Bulges
- ▸Hard, shiny rubber
Spare tyres
Spare tyres age too. Check yours.
Buying tyres
When fitting new tyres, check the date codes on the tyres being fitted. Tyres can sit in stock for some time before sale; they should not be very old when new. For cars that do low mileage, tyres may age out before they wear out, so date checks matter more. Caravans and trailers often have this problem, as tyres can look fine but be dangerously old.
CAUTION: This is general automotive information, not professional mechanical advice. Always follow your vehicle manufacturer’s specifications and service schedule, and have brakes, steering, tyres, and other safety-critical systems inspected by a qualified mechanic.