Abstract: A scooter includes a footrest, a front tube installed at the front of the footrest, a rider riser pivotally connected to the front tube, a handle installed at the top of the rider riser, a front wheel installed at the bottom of the rider riser, and a rear wheel installed at the rear of the footrest. The front wheel is installed at the bottom of the rider riser and biasedly disposed on a side of the front tube. A rider stands on the footrest and operates the handle and scooter by hands and body to swing the front wheel sideway to produce an S-shaped movement pattern and drive the scooter. Such bias design with a turning point of the rider riser provides biased component forces to the handle and scooter body separately to move the scooter forward and improve the force applying efficiency, variability and fun of the scooter.