Pneumatic radial tyre.

摘要

A pneumatic radial tyre comprising a tread provided with at least two main grooves (G1) extending in the circumferential direction of the tyre and lateral grooves (G2) connecting said main grooves (G1) to form multiple tread blocks (5) having two side walls (3) facing the main grooves (G1) and two end walls (4) facing the lateral grooves (G2), characterised in that each of said blocks (5) is provided on the side walls (3) thereof with at least two side grooves (7), the depth gW of each side groove 7 in the axial direction of the tyre being not less than 5% and not more than 50% of the block width BW defined as the distance between the side walls (3) of said block (7), the width gL of each side groove (7) in the circumferential direction being not less than 5% and not more than 25% of the block length BL defined as the length between the end walls (4) of said block (7), the depth gH of each side groove (7) being not less than 15% and not more than 80% of the groove depth GH of the main groove (G1), whereby performance on the snowy and icy roads and noise generation and wear resistance on the normal roads are well improved in good balance.