When should I change my tyres due to age?

I have a BMW 520d which is six years old and has completed 56,000 miles on three of the original Goodyear runflats, which still have 4mm left. Should I consider replacement due to age or mileage. They still drive well but have a little less grip?

Asked on 2 May 2015 by Henry

Answered by Honest John
If you are starting to notice less grip, especially in the wet, change at 3mm. The legal limit is 1.6mm, but the safe minimum except in bone-dry weather is 3mm.
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