 This is a optional ST Racing Concepts 42T CNC Machined Light Weight Delrin Center Spur Gear, and is intended for use with the OFNA Hyper 10SC. The Light Weight Delrin 42T Center Spur gear helps reduce the transmission noise of your Hyper 10SC, while adding efficiency and more importantly increasing acceleration. Weighing in at barely 4 grams, this Delrin spur is nearly 1/5th of the weight of the stock steel spur (18.5 grams), and is also thicker than the stock piece, giving the pinion gear more gear mesh contact for increased durability.
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