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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.
Bridgestone also opened up a $6 million test track adjacent to the Advanced Tire Production Center to support passenger tire testing and development. The test track opened in autumn 2022. Bridgestone has invested more than $125 million in its Akron operations since 2012, when the company opened the Bridgestone Americas Technology Center. [15] [16]
A boxer-style flat-six engine is able to have perfect primary and secondary balance.As in other six-cylinder engines, the overlapping of the power strokes of the different cylinders (with a firing interval of 120 degrees in a four-stroke engine) reduces the pulsating of the power delivery relative to that of similar engines with fewer cylinders.
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 ...
[4] 1975's Ferrari 312T used a Goodyear 26.0"×16.2"–13" slick tyre (overall diameter × width) in the rear on a 13"×18" rim, with a Goodyear 20.0"×9.2"–13" slick tyre in the front on a 13×10" rim. [5] For the 1981 season the maximum diameter of the rear tyre was limited to 26.0", while the diameter of the front tyres was increased.
In April 2011, Porsche announced the third generation of the 997 GT3 RS with an enlarged 4.0-litre engine having a power output of 500 PS (368 kW; 493 hp). The naturally-aspirated 4.0-litre flat-six engine (the largest engine displacement offered in a street-legal 911) was introduced with their 2011 911 (997) GT3 RS 4.0 , in 2011. [ 18 ]