This product adopts shaft drive can provide efficient energy transmission to ensure smooth operation and stability of the dynamic bike; through a well-designed gear set, the drive connection between the rear wheel and flywheel is realized, so that the base flywheel can rotate according to the riding speed to provide a realistic riding experience; the product has a detachable design, making it easy for the user to separate or connect the wheel from the flywheel to achieve a quick conversion operation, so that it can be used flexibly at home or outdoors.