Tire tread with zig-zag grooves with projections in groove

摘要

A heavy duty pneumatic tire having a tread provided on its outer surface with at least one circumferential groove. On the groove wall multiple projecting blocks are provided at an interval between the adjoining projecting blocks in the circumferential direction corresponding to 10-50% of the circumferential length of the projecting block and between the projecting blocks on the opposite groove walls a narrower groove is formed circumferentially having the open groove width corresponding to 5-50% of the open groove width of the above mentioned wider circumferential groove.