Kevin, just to give you some numbers Beavrun: race tires 1:06s, street tires add about 3 seconds Nelsons: race tires 1:17s, street tires add about 2 seconds Grattan: race tires 1:28s, street tires add about 4 seconds and they turn to snot about half way through a session. They will help with confidence and you will go faster on them once you see how crazy sticky they are. Are they needed for I group, not really, are they needed for A group, not really, but this all boils down to ability. It just makes one less thing to worry about to allow your mind to clear and go quicker.