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March 15, 2018 02:00 AM

Conti working on rubber-coated tire stud

Bruce Davis
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    OSTERSUND, Sweden—Continental A.G. is developing a rubber-coated tire stud that it claims can deliver greater ice grip while reducing the negative impact on dry road surfaces.

    Conti claims the rubberized spike—which could be market-ready within three years—can deliver up to 7 percent greater grip on ice while reducing road wear by as much as 20 percent and cutting down on noise generated by a spiked tire.

    Developed by Conti engineers in-house, the rubberized stud features a flexible rubber body molded around the metallic spike, a design element that Conti claims allows the spike to penetrate the ice deeper than a stud without the rubber shielding.

    This in turn generates higher forces and added grip, as does the rubber-on-ice contact.

    Conti's work on this and other stud design improvements of the last few years was aided by its 2008 acquisition of Tikka Spikes Oy, a Tikkakoski, Finland-based producer of tire studs, a company spokesman said.

    Conti discussed this development at its recent "Vision Zero goes North" TechnikForum in Ostersund, where it also unveiled a pair of winter tires developed for the 2018-19 winter season — the Winter Contact TS 860 S and Viking Contact 7, neither of which is slated for sale in North America.

    Nokian Tyres P.L.C.

    Nokian claims the new stud concept helps to optimize braking, acceleration and cornering on icy and snowy roads.

    The new spike design comes on the heels of the disclosure last year by Nokian Tyres P.L.C. of a "functional stud concept" that plays a key role in the company's newest Hakkapeliitta winter tire range.

    The new stud concept, which involves "dedicated, tailored" studs for the center and shoulder areas of the tread surface, helps to optimize braking, acceleration and cornering on icy and snowy roads, Nokian claims.

    Juha Pirhonen, vice president of research and development for Nokian Tyres, said the new stud concept balances "longitudinal and lateral grip with eco-friendliness" thus allowing drivers to remain safe even if the weather and grip level change suddenly.

    The studs in the center area feature a beveled body and a wider pin, which allows them to penetrate deeper into the ice than before, resulting in improved braking grip and lateral grip, Pirhonen said.

    The studs on the shoulder areas feature a triaxial hard metal pin designed to withstand lateral forces, he said. When cornering in a vehicle, the grip edge of the stud will always encounter a maximal section of the driving surface, enhancing lateral grip.

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