Originally Posted By: zeng
Continental says : 10 years after production.
Continental essentially say they
have to say 10 years after production, because everyone else does, but they don't really know why.
As firm statements go, that's firmly lodged in a CYA location.
I've seen some fairly small sample-size on-road (as opposed to lab) German data on tyre failure correlated with age, but thats dodgy since tyres are widely abused in service by underinflation, even in Germany.
Tricky for tyre manufacturers since they don't want to get stuck with ageing inventory.
Car manufacturers handbooks tend to say 6 years, since they have nothing to lose, and they get sued a lot, so CYA is an imperative with no downside for them.
My handbook is in Chinese, so easy to ignore.