GM and Michelin will bring airless tires to passenger cars by 2024

They'll test the tires on Bolt EVs later in 2019.

Airless tires for everyday cars might soon be far more practical. GM and Michelin have unveiled a prototype of Uptis (Unique Puncture-proof Tire System), a Michelin-made tire intended for passenger cars. It looks like Tweel and other air-free concepts of years past, but its mix of composite rubber and resin embedded fiberglass lets it operate at highway speeds -- earlier options tend to work only when you're slowly putting around. It's not as visually appealing as conventional tires, but Michelin claims it's just as comfortable.

More importantly, there's a tangible roadmap. GM will start testing the Uptis in Michigan later in 2019 on a fleet of Chevy Bolts, and expects the finished version to reach production cars as soon as 2024. The automaker hasn't named specific car models that will use the new tires.