Why Cars Still Don't Have Airless Tires, Yet

Twenty years after Michelin introduced the Tweel in 2005, airless tires remain absent from passenger vehicles despite their promise to 'eliminate nearly 200 million scrap tires a year caused by flats and underinflation,' according to Michelin's internal testing cited in a Jalopnik report. Current prototypes 'tend to transfer more road noise and vibration into the cabin than traditional radials -- making the ride harsher, especially at highway speeds.' Heat dissipation poses additional challenges as 'airless designs -- particularly those with internal webbing or solid cores -- have fewer ways to shed thermal load.' The added structural mass 'can affect fuel economy and increase unsprung weight -- bad news for handling and suspension tuning.' Federal regulations compound these technical barriers since vehicle tires are subject to rigorous performance standards, many of which assume air pressure as a baseline.

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