A concave, multi-planed scooter for performing riding tricks having handles attached to at least one end of the scooter's generally concave riding platform for a person, who is supported by the platform and riding the scooter, to hold onto. The handles are angled such that a rider's feet are placed properly for a well-centered riding position. The improved scooter has a wheel assembly attached to the underside of the platform beam in a directional aligmnent that provides the various planar surfaces of the riding platform with relatively wider or relatively tighter turning radii. Moreover, the wheel assembly may be mounted by a pinion nut system that allows the scooter ease in steering and includes an adjustment lock-nut for tight or loose steering. The two center wheel assemblies may be mounted on wedge-shaped spacers that position the wheel assemblies away from the underside of the platform beam for better stability and shock absorption. The scooter also has a decelerator consisting of a decelerator seat and decelerator pad attached to the underside of the platform beam, which pad is easily replaced when worn by removal of a screw or other means for fastening the decelerator to the underside of the platform beam.