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This would be a cool tire for the Cybertruck...!! https://www.inputmag.com/design/michelins-uptis-is-airless-car-tire-that-wont-ever-get-a-flat Would certainly solve the spare tire problem!!

Again, Citroen DS was the revolutionary vehicle for air suspension, variable road clearance, etc etc. The height is controlled not by pressure (that's more a requirement of weight) but by volume... and it used not air balloons, but (in its case) high-pressure hydraulics in cylinders with...