All cars must be built for the current Pinewood Derby Racing Season. NO REPEATS or REPAINTS. Cars must be tuned or aligned with the racer,adult supervision is encouraged. Cars may not be sent to third party facilities for tuning or other performance enhancements.
Car Dimension Rules
• The overall length of the car shall not exceed 7 inches.
• The overall width of the car shall not exceed 2 ¾inches.
• The car must have 1 ¾” clearance between the wheels.
• The car must have 3/8” clearance underneath the body soit does not rub on the track.
Derby Car Weight Rules
• The car shall not exceed 5.00 ounces. (Please note the change this year to the 1/100th due to stricter weight requirements at District last year)
• The official race scale that is used at car check-in shall be considered final.
Car Body / Dimensions
Wheel Base : Wheels must be attached to axles in located in original axle grooves.
Height : Not to exceed 3" inches...
Length : Not to exceed 7" inches...
Width : Not to exceed 2-3/4" inches...
Weight : Not to exceed 5.00 ounces (143 grams) measured on 1/100th digital scale
Additional materials may be added as long as they meet the rules.
4 BSA Axles & 4 BSA Wheels MUST be installed to the side of the car body directly across from one another.
Axles
a. Minimum diameter .084
b. Axles must have a the original BSA nail head AXLES:
c. BSA Nail type axles are required with an overall diameter of no less than .084 inches for each wheel
d. Axles must not be connected to any device that mechanically alters rotation or spin.
e. Axles must be mounted into the wood sections of car.Drilled holes or slots can be used.
Wheels
Use only Official Scout Grand Prix wheels.
A. All lettering/numbering, both inside and outside, must remain complete and be visible. The fluting and other BSA markings on the outside wheel area must remain visible. Outer wheel surface may be sanded, shaved, or polished to remove surface imperfections, mold casting burrs, and correct off center wheel bores. Outer wheel surface must not be reshaped in any way in an attempt to minimize tread contact or alter aerodynamics. Tread surface must be flat and parallel to the wheel bore. Coning the hubs and truing the inside tread edge is allowed.Tread width may not be less than 7.5 mm. You may add material such as glue,fingernail polish, or tape, to the inside of the wheel to aid in balancing of the wheel, but no material may be removed from the inside surfaces. Minimum diameter of wheel is 1.16” to maintain the ridges on the outer edge.
B. Wheel Bore treatment is allowed including polishing and/or tapping. Wheel bores may not be filled and re-drilled to alter bore diameter or to achieve better fit with the axle.
C. There must be at least four wheels on the car, and all four wheels must make contact with the track surface.
The following wheel modifications are PROHIBITED:
A. Rounding of tread surface/wheel edges or grooving,H-cutting or V-cutting
B. Altering of wheel profile or Drilling sidewalls
C. Hollowing, sanding, or otherwise removing or modifying material from inside the wheel
D. Narrowing the tread surface, other than truing inside tread edge
E. Filling of any wheel surface with any type of material
Please note: There are after-market modified wheels that are LIGHTENED. This is usually done by turning the wheels on a lathe and removing.
material from the inside of the wheel. These wheels are NOT allowed and EASILY RECOGNIZED at inspection. Cars with these wheels will not be permitted to race.
Body:
• An official BSA pine wood block must be used. The block maybe shaped in any way that is desired. Per District rules: Prefabricated cars (such as the kit cars sold at Lowe) and non-wood cars are PROHIBITED.
Front End
Height: Due to the track launch pin, the front of the car must rest against a short starting pin. Therefore the front bottom of the car which rests on the pin can be no higher than 1" above the track.
Width: The front end must be at least ½ inches wide in the middle.
No part of the car body, wheels or attachments may protrude in front of the starting peg.
The car design may be enhanced by the addition of other stable materials such as plastic or metal. Any additions must be firmly attached and meet Car Size Requirements.
The following Modifications are NOT allowed
a. Starting or finish line devices
b. Electronic or lighting devices
c. Glass or extremely fragile parts
d. Paint that is wet, smudges or extremely sticky
e. Bearings and/or Bushings (this includes washers or metal plating between the body and the wheel at the axle points)
f. Sharp objects, sandpaper or abrasives on the bottom of car (We do not want any damage to the track)
g. Axles and/or wheels attached to any device that mechanically or alters rotation and spin
h. Any part of the car to go beyond the starting peg before the peg is completely lowered.
j. Propellants
k. No liquid lubricants of any kind. This includes WD-40,Nyoil, or Krytox.