Local Cub Scout pack committees determine the specific rules for each pack's Pinewood Derby competition, but most follow a basic set of guidelines provided by the Boy Scouts of America. The Pinewood Derby is a competition in which Cub Scouts build and race wooden cars typically made from a small kit containing a block of pine wood, four plastic wheels and four nails to use as axles.
According to Pinewood Pro, the Boy Scouts of America rules govern the construction of a car for the Pinewood Derby. The rules call for the cars to be no more than 2 3/4 inches wide or 7 inches long and to weigh no more than 5 ounces, explains Pinewood Pro.
No materials are allowed other than those in the kit; bearings, washers, bushings and springs are prohibited from use in the competition. Axles must be lubricated with powdered graphite or silicone; no oil may be used. The rules state that cars cannot use starting devices.
At a Pinewood Derby competition, Cub Scouts generally must present their cars for inspection and weighing. Cars that do not meet the requirements are disqualified, though Cub Scouts may be allowed to make modifications before competition begins, according to Boy Scouts of America Pinewood Derby rules.