ATR Sport 2's are nuts grippy. They treadware number doesn't really apply as those tires specifically melt and turn to crazy glue. You can see how they burn after taking them off, it's completely different to other tires. I was a huge fan of them but they aren't really available anymore.
Number 1 is tire pressure. Power to grip ratio is everything. Don't be afraid to hit all the way up to the 80s.
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