Interesting article:
http://classicsworld.co.uk/news/old-tyres-under-investigation/
My own experience is that old tyres even with full tread go hard and deliver unsafe handling somewhere between 5-10 yrs old.
http://classicsworld.co.uk/news/old-tyres-under-investigation/
My own experience is that old tyres even with full tread go hard and deliver unsafe handling somewhere between 5-10 yrs old.