Materials: ace cars must be constructed from the parts contained in the Official Grand Prix Pinewood Derby Kit.  Scouts may add materials to the car for design but not supplied parts may be replaced, with the exception of the wheels. Official BSA colored wheels may be substituted for the black wheels.

Weight: Racecars may weigh no more than five (5) ounces (total weight).

Size: Racecars may be no longer than 7 inches, nor wider than 2 3/4 (2.75) inches, nor taller than 5 inches (to clear the electronic timer). Underside clearance of at least 3/8 (0.375) inches and inside wheel to wheel clearance of at least 1 3/4 (1.75) inches. The nose height of no more than 3/4 (0.75) inch is recommended, so that the car will run on the racetrack and trigger the finish line electronics. Adequate clearance is the responsibility of the racecar builder.

Staging: The entire car must stage behind the starting pin. There must be flat surface of at least ¼’’ (.25 inch) width on the front of the car for the starting pin. No part of the car may protrude past the front of the starting pin.

Body: The car body may have no moving parts.

Weights and Attachment: Weight may be added to the car and will be considered part of the car for purposes of all measurements. "Weight" is considered to be any material on the car that is not provided in the kit. All weight must be securely fastened to the car, e.g. by permanent glue, nails or screws. Weights shall not be moveable, non-magnetic, non-electric, non-sticky.

Wheels and Axles: The car shall roll on all 4 wheels from the kit (or official BSA colored wheels). The wheels must turn about the axle nails from the kit. The axle nail dimensions may not be changed substantially; burs may be removed but not substantial material.  The following may NOT be used in conjunction with the wheels or axles: hubcaps, washers, inserts, sleeves, or bearings.

Wheels: Wheel treatment (hub and tread smoothing and polishing) may not result in substantial removal of mass or in reducing the tread (track contact) width from the original kit wheels. Wheel tread surface must be cylindrical. The wheel surface in contact with the track may not be cut, drilled, beveled or rounded. The words "Official B.S.A. Made in U.S.A." and other lettering on the wheels shall remain intact and clearly visible to the inspector. Some of the original "tread marks" on the wheel face must be intact, i.e. apparent to the inspector.

Unacceptable Wheel and Axle Construction: The following may NOT be used in conjunction with the wheels or axles: hubcaps, washers, inserts, sleeves, or bearings.

Lubricants: Only dry lubricant is permitted (i.e. powdered graphite).

Gravity Powered: The racecar may not be constructed or treated in such a way that the track's starting mechanism imparts momentum to the car. Cars must be 100% gravity powered. (For instance, this provision disqualifies cars with sticky substances on the front f the car and protrusions that may catch on the starting pin.)