Balance as a product

I make it a rule to estimate the performance of an automobile, "the body weight in combination with the brake system and tire size", " how much concentrations and adjustment are required to run straight on the straight road?" and "turn a circle as an ordinal driver's expectation".

Though the touching surface should be as smaller as possible, but it must be decided after researching by the factory designers in combination with the required area for braking phase.
The axle constructive geometry and wheel alignment play a great part of the performance, most of the time they are not so adjusted because of some cost reduction?

In another words, they the only things that the user could intervene and improve it's physical performance without destroying the equilibrium of balance as a finished product.

The third one is relatively difficult but adjustable by setting the value of rear total toe in addition to the idea the switching speed 60km as almost of factory engineers agree with.
Before tampering the vehicle's height, this adjusting procedure must be tried, because the height changing invites the displacement of rolling gravity center.

All the research and development division of the factory strives all the time seeking the best balanced equilibrium state for the next production models.