COLCHESTER, Vt. — Nokian Tyres P.L.C. has launched a high-performance, all-season tire, the WR G4, the fourth generation of its all-weather product line.
Nokian said the tire offers a reliable winter grip, performing well in snow, slush, heavy rain or sunny asphalt. The tire has the Severe Service Emblem designation for driving in winter.
The tire will come in sizes ranging from 14 to 19 inches in rim diameter and speed ratings from H to V. The full size selection will be available to consumers in early 2018, according to the tire maker.
Nokian said the tire is made with a new all-weather dual performance compound, giving the WR G4 a longer tread life. It features Centipede Siping — jagged 3D sipes on the center rib that resemble the legs of a centipede — which the company said grips the surface to maximize biting edges while maintaining handling.
Olli Seppälä, Nokian Tyres product development manager, said the sturdy, stiff outer shoulder of the tire "ensures stable and controlled handling at higher speeds."
The center area of the WR G4 offers a sturdy longitudinal rib consisting of tread blocks, while the staggered Centipede Siping works well at different turning angles, the company said, increasing grip on snow and slush and improving control.
"The rib also has hinges at the ends of the blocks, which reduces block movement," Seppälä said. "This lowers rolling resistance, which in turn improves fuel efficiency and wear resistance."
The inner shoulder has a fan-like rib pattern with functional tread blocks and blade grooves that route rain, snow and slush away from the contact surface. The sipes are staggered at different angles providing longitudinal grip and acceleration grip on snow, while the wide longitudinal grooves offer lateral grip.
The block pattern shaped on the inner shoulder side of the center rib enchances winter grip, the company said. The tread blocks are grooved so that every other sipe is attached on the left and every other on the right.
The WR G4 has the new Coanda technology, which Nokian said combats hydroplaning. According to the company, the curved design of the tread blocks on the inner and outer shoulder guides and accelerates water from the longitudinal grooves into the transverse grooves. Hydroplaning prevention properties are retained as the tire wears.
Nokian said its silent sidewall technology includes a tailored special rubber compound between the sidewall and tread that filters sound and vibration from the driving surface, preventing sound waves from entering the sidewall and into the rim and vehicle.
The tire maker said the tire was tested both at Nokian's proving grounds in Finland as well as on test tracks in Germany and Spain, and tread wear performance tests were performed in the U.S.