2 Reasons:
1) Shock absorption. By filling a thin layer of rubber with air, the skin of the tire becomes a shock absorber on its own. As the tire recieves an impact, it flexs in response to the pressure change within. This makes not only for a smoother ride but makes components last longer
2) Weight. You want a vehicle to be able to quickly accelerate/decelerate. Pick up a tire, it’s already fairly heavy as is when it’s just a thin skin of rubber. Imagine FILLING that thing with rubber and imagine how HEAVY that would be. Now, imagine trying to start/stop that weight rolling. It would require a ton of force to start and be hell to stop.
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