Abstract
Judging from the viewpoint of automotive safety and more space by eliminating a spare tire, the development of the run-flat tires is important. Many problems relating to weight increase and usability had to be solved in the course of the development of such tires. The N type run-flat tire, described in this paper, has a simple structure with reinforced side walls and additional beads to fit the rim flanges. Though this tire system brought about a small amount of weight increase, it needs no special part, therefore the conventional road wheels, air valves and tire changers may be used. Passenger cars equipped with these tires have been tested, with particular attention being paid to vehicle dynamics, such as steering and stability. It appears that such tires are safe even for driving on expressways when they are flat.
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