Tire / Wheel Mods?

[aerohead]

Some things that crept into my mind: 1- the rigid tire would have little or no traction in a locked scenario,the tread-blocks unable to deform and maintain a contact patch. 2- since there is no "air-spring" present,the rigid tire would require internal reinforcement to allow it to maintain it's form during transient loading,which would add mass to perhaps an already massive tire,upping the polar moment of inertia which would work against your mpg. 3- I find it difficult to imagine a suspension system which could isolate the multitude of vibratory impulses easily absorbed in a pneumatic tire.Should even a fraction of these impulses be communicated into the cabin of the rigid-tire car,the stress to the occupants from "harshness" might drive 'em up a wall. 4- a collision with road debris could cause a rigid tire to leave the road surface momentarily,especially dangerous if in the middle of a high speed curve,at night,in the rain. 5- should a rigid tire undergo a "failure",what kind of "backup" safety attribute would there be? You're already "riding on the rim".