Bridgestone 3rd Generation Run Flat tire

www.eurocarnews.com - Summary of new technologies that enable the third generation

Heat control is the key to the technologies that enable third-generation run-flat tires. The simplest way to improve the riding comfort of sidewall-reinforced type run-flat tires is to make the tire sidewalls thinner and softer. However, when driving with a puncture, deformation of the tire sidewalls increases and generates more heat at that portion. How to deal with this heat generation while maintaining and increasing the durability of run-flat tires (after they lose inflation pressure), became a major challenge in efforts to improve riding comfort. In response, Bridgestone has developed three technologies to solve that puzzle: new sidewall-reinforced rubber that can reduce heat generation, a new ply that can reduce deformation growth, and COOLING FIN technology that can cool the tire sidewalls. Because each of these technologies improves riding-comfort performance separately, Bridgestone will select the technologies as appropriate when developing commercial products. (Based on tire sizes, the weight of the vehicles and when technologies become available for practical application.)

New Sidewall-reinforced Rubber that Curbs Heat Generation

By adoption of NanoPro-Tech, we have created a new sidewall-reinforced rubber with improved carbon dispersion. The new rubber reduces the friction that occurs between carbon molecules when tire is loaded and reduces heat generation. Compared with second-generation sidewall-reinforced rubber, the new rubber can reduce by half heat generation due to deformation of tire sidewalls when driving on tires that have lost air pressure.

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