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Get GroovySiping or grooving a tire's treads is a good way to break up large, inflexible tread blocks and to add biting edges for slick weather traction. Siping involves cutting thin slices through a thick tread block. The tires will maintain their original look, but the tread blocks will be free to flex and spread, giving more biting edges to aid in wet or icy conditions. Siping can also improve on-road tread life and help a tire resist chunking. Grooving employs a tool that cuts away portions of the tread blocks to reshape the tread design. It's a good way to increase the flexibility of a tire carcass with large tread blocks or to add channels for evacuating water or mud.