Bridgestone Airless Tire: Puncture-Proof Tech On The Way The concept tire uses a thermoplastic resin spoke structure along the inner sides of the tires that supports the weight of the vehicle, just as pressurized air does in a regular tire. That means no risk of leaks, and no risk of punctures. The resin is also 100 percent recyclable which makes it far greener than regular tires, many of which go to landfill and at best, are cut up for insulation and other uses. Bridgestone envisions a continuous cycle of recycling and re-use as the thermoplastic can be constantly re-formed when heated. Michelin also tried working with airless technology back in the early 2000s but the tech has now got to the point where its becoming production viable. More at the link.