Block. Height: 1.25'; Width: 1.75'; Length: 7.0'. Weight. Total: 5.000 oz. Wheels 3.6 g (stock, 1.0 g minimum practical). Wheelbase. Stock 4.406' (4-13/32'). Example Pinewood Derby car construction rules from the 'Cub Scout Grand Prix Pinewood Derby Guidebook' (BSA No. 33721). The car must have been made during the current year (the year in which the derby is held). The width of the car shall not exceed 2-1/4 inches. The length of the car shall not exceed 7 inches. The standard pinewood derby block is approximately 7.0 inches long by 1.75 inches wide by 1.25 inches tall. It has a typical density of 0.0138 lbs/in3. The block is supplied unsanded with grooves cut on the bottom side to accept the axles. The blocks weigh approximately 3.4 ounces. The overall length of the car shall not exceed 7 inches. The overall width of the car shall not exceed 2 ¾ inches. The car must have 1 ¾' clearance between the wheels. Very few races allow a car longer than the standard 7' block length so don't add anything to either end of the car. Your pinewood derby car should be under 4' . Pinewood Derby season is approaching fast and will race by before you know . Also, get a chance to weigh your car, take a turn on the practice track, and more! From polishing the axles to placing weights, there are many secrets to make your Pinewood Derby car go faster. Here are some of the best. OFFICIAL PINEWOOD DERBY RULES. 2015. Car Dimension Rules. • The overall length of the car shall not exceed 7 inches. • The overall width of the car shall . Free Pinewood Derby Speed Tips to help you build a faster car. . as long as the car, including the wheels, does not violate the 7 inch maximum length rule.