| 摘要 |
PURPOSE:To improve abrasion resistance and maneuvering stability with ice/ snow performance kept at a practical value in a pneumatic tire in which foaming rubber is provided on its tread. CONSTITUTION:At the time of travel on an ice/snow road surface, a one-side rubber layer 24 displays ice/snow performance to some extout with grooves 18 and sipes, etc., on the other hand, the other side rubber layer 25 displays high ice/snow performance because independent bubbles formed in the inside are made exits for water films to keep the ice performance of a whole tire 11 at a practical value. Also at the time of travel on a dry road surface, non- foaming rubber (one-side rubber layer 24), having relatively high rubber hardness, exists on one side from a boundary 23, consequently rigidity as a whole tread rubber part 22 is increased to improve abrasion resistance and maneuvering safety. |
