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Some motors in the market use this kind of wheel. 50mm-120mm.The middle hole is conical, front diameter is 15mm, and back diameter is 10mm.The smaller the speed is slower. How to calculate the working speed for different wheels:For example, your sewing machine motor wheel diameter is 7.5cm, and its ..

Almost 90% motors in the market use this kind of wheel. 40mm-120mm.The middle hole is straight, front and back side diameters are both 15mm.The smaller the speed is slower. How to calculate the working speed for different wheels:For example, your sewing machine motor wheel diameter is 7.5cm, and its..