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A run-flat tire is a pneumatic vehicle tire designed to resist the effects of deflation when punctured, allowing the vehicle to continue to be driven at reduced speeds for limited distances. First developed by tire manufacturer Michelin in the 1930s, run-flat tires were introduced to the public market in the 1980s.
Prior to the late 1990s introduction of the Michelin PAX System [1] run-flat technology, both Michelin and Goodyear had introduced a "zero-pressure" run-flat technology, meaning that a pneumatic (air pressure-supported) tire could support itself with no air pressure. The new zero-pressure tire was a modified standard tire, constructed with a ...
High security models also feature run flat tyres, with Michelin's PAX system; which allows continuous driving at 80 km/h (50 mph) for approximately 50 km (31 mi), with a puncture. [46] BMW offers a buyback service for high security models up to seven years old, which are inspected then resold to potential customers worldwide.
The E9x saw the introduction of run-flat tyres to the 3 Series range. Models with run-flat tires are not equipped with a spare tyre. The E92 335i was the first 3 Series model produced with a turbocharged petrol engine. [9]
The company patented an early sort of run-flat tire two years later, in 1967. This technology enables the vehicle to continue to be driven in emergencies by avoiding that the tire becomes flat instantly. [7] BF Goodrich also developed the PF flyer shoe in 1933.
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