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This is a optional Team Associated 72 tooth, 48 pitch Spur Gear. This Spur Gear is intended for use with Associated B4 and T4 vehicles that use a Brushless Motor System. Featuring a new smaller design that is optimized for 17.5, 13.5, and 10.5 Brushless Motors. This Spur allows the use of smaller size pinion gears, and moves the motor forward for better balance and more predictable handling.