The overall length of the car shall not exceed 7 inches.
The overall width of the car shall not exceed 2.75 inches.
The car must have 1.75 inches clearance between the wheels.
The car must have 3/8 of an inch clearance underneath the body so it does not rub on the track.
Car Weight Rules
The car shall not exceed 5.0 ounces.
The official race scale that is used at car check-in shall be considered final.
Car Modifications
The official pine wood block must be used. The block may be shaped in any way that is desired. Bodies of other materials or pre-cut will be grounds for disqualification.
You may add additional items (fins, engine, etc) to the body of the car as long as the body is the official wood block.
Official BSA wheels must be used. The wheels may not be cut, drilled, beveled or rounded. You may remove the seams and imperfections from the wheels.
The axles may be polished. No washers, bushings, bearings or springs are allowed. You must use the stock axles provided in the BSA kit.
Axles must remain straight and use original guides for placement. Bent axles, rail riding, 3-wheel setup, or similar modifications are not allowed.
Only dry lubricants are allowed. No liquid lubricants are allowed.
Weights must be firmly attached and stationary. No moveable weights.
The car must be freewheeling, with no starting devices.
Other Race Rules
All cars racing in this year’s Derby must be new cars constructed specifically for this year’s race.
Cars entered in previous races will be disqualified.
Once a car passes inspection and is entered into the race, only race committee members can touch it.
If the car loses a wheel, or is otherwise damaged, the racer shall have 5 minutes to make repairs.
Each car must pass inspection by the official inspection committee before it is allowed to compete.
The Inspection Committee has the responsibility to disqualify those cars that do not meet these rules.
If a car does not pass inspection, the owner will be informed of the reason for failure and given time within the official check-in time to make any adjustments. A car not able to meet specifications will be disqualified.