A wheel retaining device is provided for axially retaining a wheel on an axle having a notch. The cap is adapted for being affixed to a wheel. One or more springs is affixed to the cap at a lateral edge. The springs have a first position wherein the distal ends are located radially outward from the lateral edge. The springs are bendable into a second position wherein the springs are adjacent to the inboard side of the outer plate so that distal ends are urged inward. The distal ends include a protrusion that is adapted for being received in a notch on the axle. The cap is held onto the wheel by tabs that extending into apertures and catching behind the apertures. The cap is designed for maintaining the lateral position of the axle with respect to the wheel to which it is attached.