Rules? We don't need no stinking rules!
As a racing class, Buttboard was perfect to become the "Spec Class" for Street Luge, where everyone has equivalent equipment and what is being tested is just the rider's skill. If you are riding for fun you can fudge on the specs below, but why bother?

At the Hot Heels competitions in Austria if too many modifications were made to a competitor's skateboard it was booted into the Street Luge class. The modern rules were codified in 1998 to numerically capture the design limits, so people could easily create Buttboards around the world.

Each racing organization has played with minor tweaks to the text below, but essentially the rules have been stable for a decade.

CLASSIC BOARD SPECIFICATIONS (Buttboard)

The BASIC PREMISE is that any rider should be able to put together a competitive board from skateboard shop supplies for about $200 complete. A rider may spend more on a board if they wish, however, advancements which require a higher investment to be competitive, will be banned.

A. DECK: Must be made of wood. The deck may have molded features such as a kicktail, but must be one piece. No dropped boards. It may be any shape within the size limits. Nothing may be added to the deck except for the following:

 1. Foam padding to the top.

 2. Non aerodynamic stiffeners to the bottom.

 3. Skateboard-type grip rails underneath.

B. WEIGHT: The complete board must not exceed seven kilograms (15 lbs).

C. LENGTH: One hundred twenty-five centimeters (125cm / 48") maximum.

D. WIDTH: Three hundred five millimeters (305mm / 12") maximum.

E. TRUCKS: The trucks must be lean steer activated. They must be commercially available* skateboard trucks. Trucks may have a rolling axle. They must not exceed three hundred five millimeters (305mm / 12") wide, as measured from the outside edge of the axles. The board must use exactly two (2) trucks.

F. GROUND CLEARANCE: No portion of the board may be lower than the top of the wheels (70 mm) plus an additional 10 mm clearance. (Minimal ground clearance is therefore 80 mm or 3 1/8"). This does not apply to the trucks themselves, but does include any portion of the deck, grip rails, stiffeners, etc.

G. BEARINGS: Standard steel 608 skateboard bearings only. No ceramic, Mini-mizers, 9 balls or other high performance or exotic bearing types.

H. WHEELS: The board must use exactly four (4) 70 mm (or smaller) skateboard wheels only. They must be commercially available*.

*Commercially available means the product must have been distributed to at least 24 people outside the company.