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Regardless of grooves, outlaw compounds that cause marbles
A bit more radical, but if it was not that tyre dust and "marbles" (little bits of rubber that comes off like the rolls of rubber you get on paper after using an eraser) made most of the track unusable, overtaking will be a little easier.
Please submit any comments you have on this suggestion below
This is worth investigation.
Does anybody know how this was done? Is there a copy of the regulations on the net that we can look at?