ITEM NAME:Smart Car Robot Plastic Tire Wheel with Gear Motor for arduino Accessory To A9L4 Smart Car Robot Plastic Tire Wheel with Gear Motor for arduino Accessory To A9L4 DC Gear Motor no load speed (6V): 200RPM +/-10% no load current (6V): less than equal 200mA no load speed (3V): 90RPM +/-10% no load current (3V): less than equal 150mA Voltage: 3-6 V Reduction ratio is 1:48 Tire Size Center hole: Long 5.3MM, 3.5MM wide Diameter: 66MM Width: 26MM Package included: 1 x Arduino Smart Car Robot Plastic Tire Wheel 1 x DC 3-6v Gear Motor for Robot Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.