function of riding(work use steel cable)

ride by 2 feet stepping,the driving way of transmission of the traditional bicycle with roller chains are totally changed.Ride at high or low speed?Up to you!Moreover you will enjoy riding bicycle because you won't feel tired

function of amusement(work using springs)

you step on with your two feet at the same time while you are riding,you will surely have a new feeling of riding.Wonder and joy that this newest technical product bring you