Yeah I’m not sure either. I know that typically 3.75-4” BS on 35’s seems to be pretty highly recommended but I’m not sure if that keeps the scrub radius similar to stock or not. It might be close if you go in 0.5” BS increments per tire size I guess.
(5.5” for 29’s, 5” for 31’s, 4.5” for 33’s, 4” for 35’s…)
I just wonder because I hear about squirm being an issue on vehicles with no positive or negative scrub radius so I’m curious what the stock setup is.
And then from there I wonder how stock vs altered scrub radius (or wheel placement in general based on effective BS) affects the Ackermann. I don’t see how the wheels can follow their perfect Ackermann arc based solely off the knuckle’s tie rod mounting points if the wheels can be mounted further out or in depending on backspacing. If you had a 12” spacer on each wheel and mounted the wheels way far out like that, how would they still follow the arc? I would think the wheel would have to be located in the perfect spot laterally to match the Ackermann that the knuckle in stock configuration would provide. I believe this is why many of the Jeeps with aftermarket tires chirp and squeak on tight turns. But, maybe I’m off.
And honestly probably none of it matters anyways but I just want to know for the sake of it.