Sprocket Spec: 8.0 x 22T Suitable Model Range : Electric Vehicle, Manual Tricycle(Recreation , Loading), Electric Tricycles, Four wheel utility vehicle, Recumbent Bike, Tricycle.   Functions The improved Differential Gear Device can br equipped with disc brake and freewheel , increase the safety, save one set of braking system. It can assemble on the freewheel or rear gear directly.   Lower the cost: The Second genration of the improved differential gear device is designed to lower the cost.               Sprocket Spec: 8.0 x 22T Suitable Model Range : Electric Vehicle, Manual Tricycle(Recreation , Loading), Electric Tricycles, Four wheel utility vehicle, Recumbent Bike, Tricycle.   Functions 1.Rotated differential gear device breakthrought the suspension function of the suspension function of the traditional gear device. 2.Differential gear device can balance the bike and the the rider during riding on the uneven surface road. Lower the cost: 3.Rotated Differential Gear Device can keep steady and safety during Patent is pending now.