[Darren69]

It's very true that rubber being a natural product, degrades over time of course, the factors to affect that are debatable however. UV is one know factor, so maybe ozone could be another, who knows? When I checked the tyres on my 748 that's been in my dining room untouched and covered for most of 8 or so years, the tyres have definitely hardened and now feel like plastic! Can't really be UV since they've been covered so I think it is the age, maybe the american fridge freezer I have in open plan kitchen/dining room is to blame? But I think its just old age.