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Parameter Operating voltage: 3V ~ 12V DC (recommended value is 6 ~ 8V) Maximum torque: 800g.cm (3V) Speed without load: 170RMP (3V) Reduction ratio: 1:48 Load current: 70mA (250mA MAX) (3V pm) With EMC, it has strong anti-interference ability and causes no interference to micro-controller. Tire Parameter Center hole: 5.3MM x 3.66MM Diameter: 66MM Width: 2.66MM Package Content: Smart cart tire x1