Tyre Wear.......

[DannyG]

Did anyone else notice the tyre wear at Melbourne, it appeared to me as though the grooves were virtually gone at the end of the race on some cars.
Looking at the lap times its obvious that the new tyres are consistant for the entire race, i wonder how much of the times were coming from tyre consistancy or is it that the wearing tyres are giving a larger contact area, effectivly becoming true slicks?

Isnt there a rule regarding the grooves having to still be there at the end of a race? Whats stopping the tyre manufacturers making the tyres so that they become slicks quickly giving more grip? Is it even possible?

I done a search for previous tyre related threads, none of them appeared to discuss this specific topic to much, so sorry if it has been discussed before.