Pneumatic tyre

PNEUMATIC TYRE Abstract A pneumatic tyre comprises circumferentially-continuously-extending crown 5 main grooves (3) and shoulder main grooves (4) to divide the tread portion into one crown rib (8), two middle ribs (9) and two shoulder ribs (12). The middle rib (9) is provided with a circumferentially-continuously-extending middle sub groove (5) to define an axially inner part (10) and an axially outer part (11). The axially inner part (10) is provided with inner middle lug grooves (15) comprising an axially outer wide main part io (15a) and an axially inner narrow part (15b). The axially outer part (11) is provided with outer middle lug grooves (16) comprising an axially outer main part (16a) an axially inner sipe-like narrow part (16b). The width and position of the middle sub groove (5), and the widths of the lug grooves (15 and 16) are specifically defined in order to improve the wet performance and noise performance in a well balanced manner while maintaining the is steering stability. / x 0 ) CYCu C) -