Ply format for sub-tread reinforcement of a self:supporting tyre - modified to improve delamination resistance of sub-tread ply borders

摘要

Parent patent described a safety tyre having sidewalls with lenticular section rubber interlayers for radial support and subtread reinforcement incorporating a thick (at least 2 mm) rubber interlayer to inhibit distortion by flexure if the tyre was unpressurised. The pad was located between a base ply and a pair of cross-ply bandages. This addn. defines the width of the base ply as being either (a) less than the width of the other sub-tread reinforcement layers; or.