I've read about this but it was a long time ago. From memory the manufacturers suggest you return the tyres to the factory for a safety check at four years. Obviously we can't do that.
To avoid buying old stock I've tended to buy the latest model from my favoured brands which should ensure recent manufacture. I wouldn't normally ride a bike with six or seven year old tyres, they'd normally have all the grip of a plank of wood.
There is a grey blur, and a green blur. I try to stay on the grey one. - Joey Dunlop
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