Good point. My car is a 4-link with leafs, so the wheelbase is already set. Coil cars are different bundle of sticks. In my conversations with people who know more than me, I have been told that a coil x 4-link is a lot harder to get a handle on, and way easier to get the set-up way out of whack. Even my set-up can get wonky, if you go a couple turns the wrong way when playing with pre-load.Bottom bars set the wheel base, top left sets the pinion angle and TOP right sets the preload.