A. The maximum width for the right rear wheel will be 18 inches. The maximum width for the left rear wheel will be 15 inches.
B. The maximum wheel diameter will be 15 inches.
C. Plastic and/or carbon fiber wheels will not be permitted.
D. Only steel or titanium wheel cover fasteners will be allowed.
E. Wheel covers: it is highly recommended that wheel covers have a minimum of 5 mounting points. However, both 5 and 3 mounting point wheel covers will be allowed for competition under the following conditions: Wheel covers having a minimum of 5 attachment points may use dzus fasteners. All dzus fasteners must be made of magnetic steel or titanium only. Wheel covers having only 3 attachment points must be bolted-on at all 3 points utilizing a minimum 5/16” flanged magnetic steel or titanium bolt and an approved fastening (nut assembly) system.  Approved fastening (nut assembly) systems:

a. Keyser Manufacturing – Part # 100 7-101
b. Wehr’s Machine – Part # WM377A-312 Aluminum 5/16
c. Wehr’s Machine – Part # WM377S-312 Steel 5/16
d. Triple X Chassis – Part # SC-WH-7810 (for a 1” spring)
e. Triple X Chassis – Part # SC-WH-7820 (for a 1 3/8” spring)

Optional fastening systems that are equal or superior to the above-approved system will be readily approved at the sole discretion of World of Outlaws Supervisory Officials.

F. Digital air bleeders are allowed but cannot be remotely controlled.  Air may not be introduced to the tire from any onboard system.