Finally a lightweight option for speed sets and spur gears. This 55 tooth spur gear comes with a 19 tooth DDM "Black Magic" pinion, for increased top speed. Our gears are made with proper tooth profiles so the total number of teeth will always be 74. For example: 17/57, 18/56, 19/55 and so on. These gears are made from a tough and durable material that resists wear and allows for a significant reduction in rotating mass allowing for quicker acceleration and more power being delivered to the rear wheels.