The rush was developed on Hoosier tires! Damn my name is in theirs! But they let us down big time! We had no option than to find another tire supplier. The AR-1 is the spec tire, we are developing slicks with them. The development tire was a xply and I can tell you is almost half the weight of the SRF radial! You just cant get them in quantity! Not now anyway! It was also a very forgiving tire! The R25 compound was superbly suited to the car. Nankang, stepped up to the plate when all Hoosier had to say was "Covid 19, explain to your customers why you cant deliver cars with tires', they will understand!! Those were the exact words! It may surprise you but that didn't fly too well with me. When tracking the RUSH there are a good number of tire choices. That said the AR-1s performance at $696 / set is hard to beat. Blair and a few others, have set some blistering laps at several tracks on the stock car and AR-1s! On a new set of slicks at the average track you may find 3-4 s, that's huge but a couple of sessions in the gap gets a lot narrower and a few sessions later may even reverse! That said don't forget the tire is actually the part of the car holding you to the track! How it performs tough, sometimes has a function on the steering wheel / seat link rod.