John&Joey wrote:
You should not have to rely on the sidewalls of a tire to absorb bumps. Underinflating a tire is a poor way of suspension improvement.
I don't understand your first point since the tire sidewall is supposed to flex to absorb bumps. It is one component of the entire suspension system. Otherwise tires could be hollow rigid components made of aluminum, steel, carbon fiber, whatever with a rubber tread added. Agree with your second point regarding under inflation, but a tire is underinflated when PSI is less than required by the load inflation chart for the actual weight carried. If under inflation were defined as say 25% below the max PSI stated on the sidewall, then there would be no need for inflation charts going all the way down to 30 psi on 80 psi rated tires.