Hoosier A7 tire size on flared car Options

[PlaysWithCars]

I've been running 225/45R15 on 7" and 8" wheels and they worked fine. But now that I need new tires I'm going to 8s all the way around and debating about stepping up to 245/40R15. Anyone have experience with 245 on 8" wheel? It's within spec from Hoosier for that tire and through email correspondence with Hoosier they said it would work fine. I also asked them about building heat in the tire since I struggle with that on the 225s already. They said that yeah I would build less heat but the cooler 245s would generate more grip than slightly warmer 225s.

[PlaysWithCars]

The 245s mounted up fine on the 8" wheels and don't appear to be "pinched" at all. The distance across the beads of the tires before they were mounted was right at 9" so I'm sure they would be happier with a wider wheel, but they seem fine on the 8s. Mounted on the car the sidewalls are very stable when you shake the car side to side. I think 8s will work.

On the car the rear is a tight fit with only about 1/4" clearance to the inner fender wall. the first autocross is tomorrow so we'll see if there are any rubbing witness marks after suspension articulation and sidewall flex at the event. I may need to add a small shim but there isn't a lot of room to outer fender lip, so if I have to shim, I'll have to get them 'just right'. On the front the extra 1" of wheel width is all to the outboard side and allowed the tire to fill out the fender nicely. Looks like I'll have plenty of clearance up front. But again, will be doing an inspection after the event to look for rub marks.