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This is a Hoosier rear tire that Wright has modified. It differs in stock form from a front tire because the tread pattern is squared up. Wright cut two grooves 90 degrees from each other through each square tread and then bisected each of the four blocks in the tread with four sipes (two horizontal and two vertical). The extra edges created by the grooves and sipes not only increase traction, but also help the tire reach prime operating temperature more quickly.