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About TT motor: This is DC gear motors and the torque is large£¬ the current is low and they are suitable for battery applications. They are very popularly used in smart car£¬ boat mode. - No-load speed: 100 r / min @ 3V£¬ 200 rev / min @ 6V - No-load current: 160mA @ 3V£¬ 220mA @ 6V - Reduction ratio: 1:48 - Shaft length: 7.9mm - Rated torque: 0.4kg.cm About the rubber wheel: - Tire diameter: 65mm - Tire width: 27mm - Applicable Motor: TT motor - Very wearable - Beautiful appearance - Great for DIY and smart car projects