82bonne said:
What's the tallest and widest tire I could possibly run with the frame notch
The largest drag radial I've run is a MT 295/65R15 on a 8.5 rim with 5" of backspace, it is nearly 30" tall and about the widest you can fit without it sticking out of the whellwell on a Monte Carlo other g-bodies will vary slightly because of wheelwell shape and size.I know the Cutlass is harder to fit because of the squared off wheelwell and Regals have a larger wheel flare than mine.
The largest bias ply I run is a Hoosier Quicktime Pro 29 x 11.5 but on the 15 x 8.5 rim with 5" backspace these would rub slightly if when the car would go sideways so I put them on a 15 x 8 rim with 4.5 backspace and that solved the rubbing issue.The bias ply has a slighly wider section width so maybe a 1/2" of the bulge sticks out past the wheelwell.
Also my frame notch is exactly flush with the inner wheelwell. I prefer to not have any of the tire sticking out past the wheelwell especially with a drag radial.
You still have to trial and error your'e own fitment and you can always use one of the wheel fitment tools out there to aid you.Hope this helps.