| abstract |
A tire (1) having improved grip on melting ice is provided, wherein each of blocks (6) of a tread (2) of the tire (1) comprises a plurality of incisions (12) circumferentially extending to form openings to one of sub grooves (5) of at both of frontal faces (8, 9) of the tire (1), each of the openings has an opening width (w1), a ratio of the sum of the opening widths (w1) of the incisions (12) on each of the frontal faces (8, 9) to a block width (BW) is between 10% and 60%, the incisions (12) have a depth (d1) circumferentially extending, and a height (h1) radially extending, a ratio of the depth (d1) to a block length (BL) is between 0 and 30%, a ratio of the height (h1) to a block height (BH) is more than 50%. |