Q Tires: Equipped with retractable studs

First, we had the run-flat tires, now we've got the retractable-stud tires. It might sound like something off a sci-fi movie but actually, Q’s patented technology is quite simple; the retractable-stud tires incorporate an air-bladder that forces the studs in or out depending of course on the weather conditions. The studs can be activated and retracted about 50 times before the bladder needs to be refilled with air. According to reports, Idaho, Washington, Oregon and Montana are expected to pass legislations that’ll allow Q tires to be used all year round

Source: CarScoop