Albion XV wheels are polyurethane wheels with v-grooves for use with floor tracking systems. The wheels have a relief groove at the base of the V, which helps equalize the load to each face of angled track when in operation. Wheel face and bore are machined for concentricity to proper tracking. These wheels can be used not only on a track, but any flat surfaces. When using a track, please be aware that track alignment is critical for proper operation.