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The Structure and Working Principle of Unidirectional Bearing A unidirectional bearing is a kind of bearing that can rotate freely in one direction and lock in the other direction. The metal shell of a one-way bearing contains a lot of rollers, needles or balls, and the shape of its rolling seat (cavity) makes it only roll in one direction, and a unidirectional bearing will produce a lot of resistance in the other direction.

http://www.intertractyre.com/pcr/tc575-winter-car-tyre-185-65r15/ Winter/snow tires, special design for North America, Canada and European market. Tire ranges are from 14 inch to 18 inch to meet most of the markets' demand. This pattern with "3D SIPE" design, with better traction performance and snow is ejecting sipe. Unidirectional pattern design ensure the excellent self-cleaning ability and better grip performance; Spin-dry govern design avoid the sideslip and ensure good grip performance