pnichols wrote:
I wonder why a foam ring (of very high quality durable and stiff foam material) of a little less diameter than the tires and a little greater diameter than the rims couldn't merely be installed, after removing the outer tire, and then compressed into place "forever" as you reinstall the outer tire and tighten the lug nuts?
This ring would of course flex all the time with the sidewalls while at the same time nearly 100% prevent the wedging of rocks in between the tires.
A possible reason why it would not work well is heat dissipation. I don't know enough about the specifics of tire technology to know how much of an issue that would be. Presumably for many class C motorhomes where the tires are near their maximum rated load it's more of a concern than with a less heavily loaded vehicles.
One simple way to reduce the likelihood of damage from stones wedged between the dualies is to install a spacer to increase the gap between them.
