Rules

All the BSA (Revell) pinewood derby kits come with some basic rules in them. However, the rules are not very specific and leave a ton of room for interpretation.  If you have been in charge of a race in the past you know how many problems this can cause. So what we have here is three different rule sets taking from league and national races.(Strict,Medium,Open) It is not posted in these rule sets but approved lubrication for wheels is open to graphite, and oil. If you have not tried the oil's available you are missing out. No more graphite mess! For the best and fastest on the market see our link section.

Strict. (Pure Stock)

1. Car Body / Dimensions

Wheel Base : 4-3/8" Center to center axle placement / 7/8" from end of body 1-3/4" other end of body see diagram below
Height : Not to exceed 3" inches...
Length : Not to exceed 7" inches...
Width : Not to exceed 2-3/4" inches...
Weight : Not to exceed 5.0 ounces (143 grams) measured on 1/10th digital scale

• Wheel base Note : No less than 7/8" from end of body / No more than 1-3/4" on the opposite end of body
  Wheelbase must be 4-3/8" measurements are not going to be checked to the 1000th"
  
  
• Additional materials maybe added as long as they meet the rules
  
• Other types of materials may be used to construct your own body and/or frame
  
• 4 Axles & Wheels must be installed to the side of the car body / No more than a 45 degree angle

Track Center Rail Height : 1/4" inch ( 7mm ) *
Track Center Rail Width : 1 5/8" inches (4.2 cm) *

* Wheels must clear the outside to outside center rail width measurement

Center Guide Rail & Wheel base diagrams click on photos to view



2. Axles
a. Minimum diameter .084
3. Wheels
BSA (new and/or old)
a. May be CnCed, lathed, polished and/or sanded to true the edge of tread, surface and circumference
b. The tread / contact surface must remain flat and parallel to the bore as humanly possible
c. Some of the small detailed ridge marks at the edge of the tread must remain visible around the entire circumference
d. No Angling, Reshaping, Canting, Round Crowning, Tapering, H-ing, V-ing, Dishing, the outside of the wheels and/or tread surface
e. No removing or reducing the letters or spokes
f. 7.50mm Minimum Tread Width / 31mm Maximum Diameter
g. No drilling additional holes
h. No additional weight reduction is allowed other than hub reducing
i. Wheel covers may be used only if entire wheel is visible

(Wheels will be checked with digital calibers if needed)

4. 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
f. Sharp objects, sandpaper or abrasives on the bottom of car (We do not want any damage to the rubber stopping pads)
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 (see photo below)
j. Propellants

Medium(Stock)

1. Car Body / Dimensions

Wheel Base : Any
Height : Not to exceed 3" inches...
Length : Not to exceed 7" inches...
Width : Not to exceed 2-3/4" inches...
Weight : Not to exceed 5.0 ounces (143 grams) measured on 1/10th digital scale

Track Center Rail Height : 1/4" inch ( 7mm ) *
Track Center Rail Width : 1 5/8" inches (4.2 cm) *

* Wheels must clear the outside to outside center rail width measurement

Center Guide Rail click on photos to view

2. Axles
a. Minimum diameter .084

3. Wheels
Open Plastic Type
a. May be sanded, polished, CnCed and/or lathed
b. The tread / contact surface must remain flat and parallel to the bore as humanly possible
c. No Angling, Canting, Round Crowning, Tapering, H-ing, V-ing, Dishing the tread surface
d. No less than 7.50mm tread width
e. No greater than 31mm wheel diameter
f. No drilling additional holes
(If needed they will be checked with digital calibers)

4. The following Modifications are not allowed
a. Magnets
b. Starting or finish line devices
c. Electronic or lighting devices
d. Glass or extremely fragile parts
e. Paint that is wet, smudges or extremely sticky
f. Bearings
g. Sharp objects, sandpaper or abrasives on the bottom of car (We do not want any damage to the rubber stopping pads)
h. Any part of the car to go beyond the starting peg (Red Zone)
i. Axles and/or wheels attached to any device that mechanically alters rotation and/or spin
j. Propellants



Open Class

1. Car Body / Dimensions
Wheel Base : Open
Height : Not to exceed 3" inches...
Length : Not to exceed 7" inches...
Width : Not to exceed 3" inches...
Weight : Not to exceed 5.0 ounces (143 grams) measured on 1/10th digital scale

Track Center Rail Height : 1/4" inch ( 7mm ) *
Track Center Rail Width : 1 5/8" inches (4.2 cm) *

* Wheels must clear the outside to outside center rail width measurement

Center Guide Rail diagram click on photos to view

2. Axles
Open

3. Wheels
Open
a. Maximum diameter 31mm
(If needed they will be checked with digital calibers)

4. 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
g. Propellants
h. Any part of the car to go beyond the starting peg (Red Zone)