![]() Manufacturers like them because they eliminate the need for a spare, which in turn shaves off weight in the name of better fuel efficiency.Self-sealing tires don’t have a sealant layer in the sidewall, and they can only handle punctures up to a certain size in the tread. A cut in the sidewall will compromise a self-supporting run-flat tire’s ability to hold up the vehicle. If a nail or other foreign object punctures the tire, the sealant layer closes the hole to prevent the air from escaping, and the tire stays inflated.īoth run-flats and self-sealers are all about the tread. They contain an inner layer of sealant material along the tread. Self-sealing tires use a different approach. If the tire loses air, the ring supports the vehicle as you drive. Support ring run-flats have a thick ring, made of hard rubber or other firm material, which encircles the inside of the rim. This is the most common type of run-flat. If the tire loses air, the sidewall stays on the rim and holds up the vehicle. Self-supporting run-flats have a very stiff, reinforced sidewall. ![]() Most run-flat tires use one of two technologies. Self-sealing tires plug up the hole after a puncture, so the air inside doesn’t escape. Run-flat tires will lose some or all of their air if they’re punctured, but they still support the vehicle. The idea behind both is that you can continue driving even when your tire has been punctured, but they’re completely different in how they do this. ![]() Naturally, each has its good and bad points, and you should know the score before you plunk down your cash. There are some options, and the best-known are run-flat tires and self-sealing tires. It’s annoying and potentially dangerous to get a flat tire, and while tires have improved immensely over the years, it’s still possible to pick up the nail that will ruin your day.
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