Self-supporting type pneumatic run-flat tire, and insert and bead rubber composition for run-flat capability

摘要

A self-supporting type pneumatic run-flat tire is optimized in location and gauge of insert rubber at sidewalls, thereby enhancing run-flat and expansion capabilities. The self-supporting type pneumatic run-flat tire comprises an insert and bead rubber composition which comprises syndiotactic 1,2-polybutadiene in order to enhance run-flat capability.