Here's how the tech works, and why a new material promises to have sustainability benefits.
At best, experiencing a flat tire is an inconvenience. Whether you’re pulling out the jack and lug wrench and changing it yourself or waiting for AAA to come to your rescue, it’s a big waste of time. And in the age of electrification, a new level of tire complexity is emerging. Electric vehicles are heavy, and designers are opting to omit spare tires to save weight. Also, batteries take up a lot of real estate, leaving less room to carry a spare.
“Manufacturers are starting to apply sealant more widely,” Lux says. “It’s not necessarily new as they have been around in some form since the 90s, but it’s much better today because silicone sealant doesn’t cause ride disturbances. In the past, sealants didn’t stay in place and would shift and cause unevenness. Today’s sealants don’t cause that issue.”
“At the end of life for a tire, recycling becomes very difficult with traditional sealant inside,” Lux says. “[Traditional] sealant will gum up the machines that chop up tires for recycling.” Meanwhile, the repairable area of a tire is approximately a quarter-inch in case of a puncture, and sealant holds the tire together. Basically, run-flats can help in the case of difficult sidewall punctures, while sealant protects the tread area.
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