How do age, storage conditions and inspection history affect the useful life of infrequently used tyres?

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Hello, Infrequently used tyres can need replacement through ageing before their tread wears out. There is no universal useful lifespan: storage, maintenance and service conditions matter alongside age. Store removed tyres indoors in a cool, dry place, protected from sunlight, heat, oils, solvents and ozone sources such as some electric motors. Good storage helps preserve them, but ageing continues. Keep dated records of tyre condition and tread depth so you can compare their condition between inspections. However, a sound appearance alone cannot establish that an older tyre remains suitable for use. If the storage or inspection history is unknown, I would have a tyre professional assess them before reuse. Tyres with sidewall bulges or deep cracks need replacement. Check the manufacture date on the sidewall and follow the vehicle and tyre manufacturers’ inspection and age-related replacement guidance, even when plenty of tread remains.