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.
First World War glass–rubber exchange supply of natural rubber it was unable to produce the quantities of communications cables, tyres and fan belts required for its operations. Germany had attempted to manufacture synthetic rubber but at this early stage quantities produced were low and the product was of poor quality. Britain and France, by contrast, had access to large quantities of natural rubber from their African and Asian colonies. By early 1915 the German army was so desperate for tyres that it was considering running its supply trucks on steel tyres, which would have severely damaged road surfaces. An agent from the British Ministry of