Pneumatic tire having wide groove having two longitudinal ribs, intermediate ribs and lateral ribs

摘要

A pneumatic tire comprises a tread portion provided with a wide groove having a bottom width of not less than 20 mm. The wide groove is provided on the groove bottom with at least one longitudinal rib extending in the longitudinal direction of the wide groove, and lateral ribs extending from the longitudinal rib towards a tread face through the groove bottom and a groove wall of the wide groove, whereby occurrence of bareness of tread rubber in the groove bottom can be prevented.