1. LENGTH, WIDTH AND CLEARANCE

 

    1. Maximum overall width (including wheels and axles) shall not exceed 2 ¾”.
    2. Minimum width between wheels shall be 1 ¾” so car will clear center guide strip.
    3. Minimum clearance between bottom of car and track shall be 3/8” so car will clear center guide strip.
    4. Maximum length shall not exceed 7”.
    5. The wheel base (distance between front and rear axles) may not be changed from the official kit (4 ¼” distance).

 

  1. WEIGHT AND APPEARANCE

 

    1. Weight shall not exceed 5 ounces (141.75 grams).  The readings of the Official Race Scale will be considered final.  The car may be hollowed out and built up to maximum weight by the addition of wood or metal only, provided that it is securely built internally or externally.  No loose materials, or no moveable weights are permitted in or on the car.
    2. Mercury shall not be used for adding weight.  It is a potential health hazard.
    3. Details such as steering wheel, driver, spoiler, decals, painting and interior details are permissible as long as these details do not exceed the maximum length, width, height and weight specifications.
    4. Cars with wet paint will not be acceptable.

 

  1. WHEELS AND AXLES

 

    1. Only the official Grand Prix wheels and axles (which come with the kit) can be used.  Axles may be polished.  Wheels may be lightly sanded to remove the mold projection on the tread.  This light sanding is the only wheel modification allowed.  Beveling, tapering, thin sanding, wafering or lathe turning of the wheels is prohibited.
    2. Wheel bearings, washers or bearings are prohibited.
    3. The car shall not ride on any type of springs.
    4. The car must be free wheeling with no starting device or other propulsion.

 

  1. LUBRICATION
    1. Only dry powdered lubricants, such as graphite, may be used.  Regular oils or silicone sprays may soften the plastic wheels.
    2. Cars may be lubricated before inspection.  No further lubrication will be permitted.