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A run-flat 21.5-inch tire is an uncommon size for passenger vehicles and is typically found on heavy-duty or commercial-use equipment, such as some agricultural machinery or specialized trailers. While standard passenger vehicle run-flats rely on reinforced sidewalls, heavy-duty applications often use an internal support ring system. This technology allows the vehicle to continue operating for a limited time after a puncture, preventing breakdowns and ensuring the equipment can reach a service area safely.
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