About the rear tires of the NSR Formula cars, I don’t see a problem with the stock assembly. There seems to be plenty of clearance out of the box, although I have not trued them yet. There is much more clearance than with the Thunderslot cars. Unless the tire formula has changed, there is a lot of history with the NSR Supergrip tires; we have used them in the past, as well as the softer Ultragrip tires.
Russell