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Mattracks’ Sprositive Drive System has been specifically designed to compensate for the unequal ratios on ATV’s and UTV’s using over running front differentials. By eliminating the slack in the front sprockets pitch and changing the front to rear sprocket ratio, the Sprositive Drive allows your vehicle to stay locked in 4WD and helps keep all tracks pulling at the same speed. Mattracks offers Sprositive Drive models for Polaris, John Deere, Club Car, Bobcat, Case IH, New Holland and Cub Cadet UTV’s and some Polaris ATV’s. The new Sprositive Drive models are the XT SPs, XT UR SPs, XT UR HD SPs, M3 UR SPs and the M3 UR HD SPs.