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.
Yaroslavl Synthetic rubber mass production in factory "SK-1", the reestablishment of domestic production facilities for the production of automobile and aircraft tires in the 1928-founded Yaroslavl Tyre Factory, and the opening of the rubber-asbestos combined works in 1933. In addition to all this, the Yaroslavl Automobile Works (founded 1916) continued to produce vehicles, including a number for the municipal transport administration of Moscow, well into the 1930s. During the years of World War II, Yaroslavl managed to escape the prospect of a German occupation of the city, since the Wehrmacht did not manage to break through the Soviet defense lines surrounding