Pneumatic radial tyre for heavy load vehicles.

摘要

A pneumatic radial tyre for heavy load vehicles which is constructed to effectively suppress railway wear, and which has a tyre tread provided with at least one circumferential groove (4) to divide a tread in widthwise direction and a carcass comprising at least one carcasss ply of substantially radially extending rubber coated steel cords and a belt layer for reinforcing a crown portion of said carcass ply; wherein the zigzag angle of the main circumferential grooves (4) with respect to an equatorial line of a tyre increases in angle as the tread wears out.