A flat tire, as its name implies, can still be used normally after air leakage, so this kind of tire is also called a safety tire or a zero-pressure tire. A run-flat tire can still run safely for about 80 kilometers at a normal speed (for example, 80 kilometers per hour) under the condition of complete air leakage.
Its principle is not complicated. Generally, after a flat tire, the tire loses its air support and will collapse in the blink of an eye. At this time, because of the weight down, the wheel hub just pressed on the flat tire, and soon the tire was abruptly cut off by the wheel hub.
History of safety tires:
The history of safety tires can be traced back to the early 20th century. Goodyear Tire & Rubber Company of America obtained the patent of explosion-proof inner tube safety tire in 1934, successfully developed double-cavity safety tire in 1955, started mass production of safety tire with inner support in 1963, and became a supporting supplier of racing safety tire in 1970.
1987 The first batch of EMT (extended range motor tires) was launched at new york Auto Show. 1992 EMT was selected as 1994 recommended spare parts for luxury cars and 1995 original spare parts for luxury cars, so Goodyear became the first supplier of automobile safety tires in the world.