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Why do they need to be stored in bags?
Storage in the dark, eg at the back of the garage, will prevent the UV deterioration which is the main ageing issue for tyres.
Vans, caravans and trailers are all fitted with tyres with marginal spare load capacity, 10% at best, so should be replaced within 7 years of manufacturing date, whether used or not, due to this UV deterioration.
Cars, on the other hand, have tyres with far more spare load capacity so don't really have an issue with tyre ageing.
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