I remember watching Formula 1 in the 80's. The amount of 'marbles' from tyre degradation was amazingly high. If you have seen a race with a dry line after rain

I remember watching Formula 1 in the 80's. The amount of 'marbles' from tyre degradation was amazingly high. If you have seen a race with a dry line after rain it was that striking. And yet now, very few marbles, it would seem though that they are a lot smaller.