Brushless Direct Hub Motor BT40D seat bag battery series controller installation
APP control /Bluetooth control /easy to fit/Electric bike/16 inch / 20 inch / 24 inch / 26 inch / 27.5 inch / 29 inch / 700c/seat bag battery/longer assist range/outdoor cycling/36V 8.7Ah / 36V 11.6AH/APP control/Smart assist system/controller/IP65 waterproof
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