[Kracka]

They are a very good performance street tire. People are saying the sidewalls are a little soft for track duty, but from the sounds of it that will be no concern to your dad. Their grip is very good though, plus they're one of the lighter tires on the market (shaving rotational weight is never a bad thing). The Michelin in question is a 300 treadwear and the Continental is a 340; they're both categorized as a "max performance summer" tire.