[Ade]

hi
it is not just roughing them up it all so removes mould relaease agents and to some extent trues the tyres up as well..

From new out the box not many of the tyres will make full width contact with the track most will be under 50%.

 

[Ade]

hi
all of the above + for pace car heaven inox the rails and dust the track with one of those magic dusters and clean tidy braids..