Abstract: A pneumatic radial passenger tire having a ground-engaging portion, said tread portion being provided with a pair of substantially sinuous parallel grooves disposed in the central portion of the tire, one on each side of the mid-circumferential centerplane. Disposed axially outward of each of said grooves is an intermediate generally sinuous groove which extends about the circumference of said tire and is disposed such that alternate axially inner peaks coincide with the axially outer peaks of said central groove. An axially extending groove is provided at each of said axially outer peaks of each intermediate groove which extend out to the tread edge of said tire.