How to calculate tire size?

How close are your tires to the bottom front fender?
Are you asking me?
lol
I installed 245/50-15s on my car one summer ( a real bugaboo, I assure you), and when I backed off the drive-on hoist and hit the brakes, sad day, the tires rubbed the front corners. So I drove straight back up the ramps, dug out my tin snips, and adjusted those corners,lol.
However, by this time, my car was lowered quite a bit, And I had sucked some caster into her. I think the lowest point of the K was just 5 or 5.25 inches off the asphalt.
With the 235s from the previous post, the K was closer to 6 and the 235s never touched those corners, ever.
Over time, the K has been adjusted down again, but obviously no contact is being made.
In my opinion, you'll have to be a pretty adept and practiced driver to take full advantage of a 235/60-14, in city driving. Most of the time, you don't know what any given corner will have in store for you, as to it's surface. So you'll be slamming around the turns at maybe 50 or 60, perhaps 70 percent, cuz sliding in traffic is highly dangerous. Well if that's true, then you wouldn't actually need a 235 , I guess.
But they're a pretty good back-up for when you come in too hot and gotta slam on the brakes. So for that reason they can stay on my car. What I mean is I gotta brake a lot,lol.