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The Skytec gear set2 replaces the stock plastic gears with the stronger Skytec Delrin gears (A & B). As the modulus for the gears is changed from mod0.4 (stock) to mod0.5(Skytec) the set includes TWO motor pinions mod0.5/11T! It also includes the larger than stock SBN Japan high quality industrial grade bearing for the outer shaft gear B .
IMPORTANT: gear set 2 has 3.0mm inner diameter to accomodate the SKYTEC extended shafts!! Major conversion required!