-alan-
pfm Member
Yes, in the wet is when I can tell my tyres are ageing, it looks like there’s loads of tread left but they just don’t grip well in the wet, it can be entertaining pulling out of a tight and busy junction, it’ll easily light a tyre up and can spin them in second going in a straight line if you’re trying. I can still drive in the wet without drama but you have to be careful, it’s quite a lively little motor!
Yes - some of the oils leach out of the rubber compound through a combination of time and the number of heat-cycles the tyre has been through. The oils help keep the compound soft, which improves the grip. On some tyres when you use them really hard on a track, you can see the tyres turn a blueish colour as the oils come to the surface after hard use. The blue wears off after a while, but that's some of your 'essential oils' gone from the tyre Once enough of the oil has gone the compound starts to go hard, and the grip drops permanently.
Age can have a similar effect on the rubber - hence why it's worth checking the date of manufacture on any tyres on 'special' at the local shops or online to make sure they haven't been sitting on a shelf somewhere for the last 3-4 years.