5.0 Wheels and Axles
5.1 Only Official Grand Prix Wheels and Axles may be used.
5.2 Axles may be polished, but not modified in any way.
5.3 Wheel Bearings, washers, or bushings are prohibited.
5.4 The car shall not ride on any type of spring.
5.5 The car must be freewheeling with no starting or propulsion devices.
5.6 Wheels may be lightly sanded to remove the center ridge mold seam only. Ribs on sidewall must remain totally visible and the tire tread remain square on a flat surface. All other modifications including ridges, rounding, reshaping, under cuts, beveling, or using “lathe turned” speed wheels will not be allowed. Any modification on the portion of the wheel in contact with the track is prohibited. This area of each wheel will be inspected. Bring an additional set of wheels with you if you have any concern about this issue.
5.7 No weights may be added to the wheels.
5.8 Hub Caps shall not be used.