Pro Stock Cars

Overview: The Pro Stock Class is the stock class for advanced builders. The Pro Stock class rules are more lenient than the pure stock class. There is no maximum wheelbase restriction, and different wheel and axle makes are allowed.


P1 The main body structure must be made of wood. Car is eligible to race for a 12 month period from registration date. (Example: a car registered in November 25th, 2007 is eligible to race until 12 midnight on November 25th, 2008)

 P2. Body Specs:

A. Width - Not to exceed 2 3/4 inches (7cm)

B. Length - Not over 7 inches (17.8 cm)

C. Weight - Not over 5 ounces on scale accurate to 1/10 ounce.

D. Height- Not to exceed 2 3/4 inches (7cm)

E.  Center Rail Clearance Cars must clear the center rail which is 1 3/4 inches wide by 1/4 inch tall along the entire center length of car.

 P3. Body design may be enhanced by adding other stable materials such as plastic or metal. All additions must be firmly attached and conform to the size specifications.

 P4. No part of the car body may protrude in front of the starting peg.

 P5. There should be an unpainted, unfinished wood surface on the underside of the car at least 1/2 x 1" (12 x 26 mm) to be used for a WIRL car number stamp.

P6. The following items are PROHIBITED:

A. Springs
. Starting devices or propellants
. Electronic or lighting devices
. Liquids, wet paint, oil, sticky substance, or powders of any kind (other than axle lubrication)
. Glass or excessively fragile parts
. Wheel bearings
Loose objects on car
. Magnets


P7. Pro Stock wheels must conform to the following specifications: 

  1. Maximum 31mm diameter

  2. Full contact tread surface of no less than 7.5 mm

  3. Wheels must be constructed of plastic, rubber, or polyurethane


P8. There must be at least four wheels on the car, however it is not required that all four wheels make contact with the track surface.

P9. The wheels must be attached directly to axle and spin freely.


P10. Axles must not be connected to any device that mechanically alters rotation and spin.

 P11. Lubricants must be dry on the axle at race time. Wet, oily, or greasy axles are not allowed. Over-application of lubricant which results in excessive shedding onto the track is not allowed. Approved lubricants include (but are not limited to) graphite, Teflon, and Nyloil.

WIRL race organizers reserve the right to reclassify or disqualify any car at their discretion.


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WIRL rules copyright 2007-2012 and may not be copied or republished without permission
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