Siping (rubber) wear and extends the life of the tire. Both Bridgestone and Michelin sell snow tires that are siped at the factory, while Saf-Tee Siping and Grooving sells machines that can sipe most standard vehicle tires. Siping can also be done by hand. Siping tires may void the manufacturer's warranty. Claims that extended life is achieved by siping may only apply to certain environments, operating temperatures, and rubber compound builds. Siped soles are a characteristic feature of boat shoes. Siping (rubber) Siping is a process of cutting thin slits across a rubber surface to improve traction in wet or icy conditions.
United States Rubber Company stocks in 1928 and U.S. Rubber was dropped. In an effort to increase its share of the automobile tire market in 1931, U.S. Rubber Company bought a substantial portion of the Gillette Safety Tire Company. The company was founded in 1916 by Raymond B. Gillette and its primary manufacturing plant was located in Eau Claire, Wisconsin. The Gillette plant held large contracts with the General Motors Corporation and with the addition of U.S. Rubber products, became one of the world's largest suppliers of original equipment tires. U.S. Rubber produced tires under the Gillette, Ward, Atlas, U.S. Rubber and U.S. Royal