Tread for a pneumatic tire

摘要

A tread for a pneumatic tire and a respective tire, preferably a truck tire, is disclosed. The tread (222) comprises a first circumferentially continuous groove (20); a second circumferentially continuous groove (24); a central rib (30) interposed between said two circumferentially continuous grooves (20, 24), the central rib (30) extending continuously around a circumference of the tread (222); a first circumferentially extending shoulder rib (34) disposed laterally outside of the first circumferentially continuous groove (20); and a second circumferentially extending shoulder rib (36) disposed laterally outside of the second circumferentially continuous groove (24). The central rib (30) has a plurality of circumferentially spaced sipes (40) arranged in a first circumferential row (1) and a second circumferential row (2). The sipes (40) of the first row (1) extend between the first circumferentially continuous groove (20) and the circumferentially extending center groove (100) and the sipes (40) of the second row (2) extend between the second circumferentially continuous groove (2) and the circumferentially extending center groove (100). As the tread (222) wears and as a radially outermost portion or surface of the tread (222) moves radially inward, the circumferentially extending center groove (100) changes its width between a minimum circumferentially extending axial width and a maximum circumferentially extending axial width.