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XII. TIRE REGULATIONS:

 

1. Load Carrying Capacity: All tires must have an equal or greater load carrying capacity than the original tire. (i.e., A 1968 Mustang with a 302 c.i.d. engine had a 6.95-14 tire as original equipment, which had a load capacity of 1230 lbs. at 32psi. Assuming the wheels are changed to allow the use of high-performance tires, an acceptable replacement size would be 215/60R15 which also has a load capacity of 1230 lbs. at 32 psi.)

2. Speed Rating: All tires must have an equal or greater speed rating than original equipment (OEM) regardless of what Division/Class the vehicle is competing in. (i.e., A 1992 BMW 535i comes equipped with 225/60VR 15 tire from the factory. The car must have tires with an equal speed rating or higher to compete in any class, including Touring.

  • A. Touring Division: DOT approved "U" rated tires (or better) will be considered the minimum standard.

    B. Grand Touring Division: DOT approved "V" rated tires (or better) will be considered the minimum standard.

    C. Grand Sport Division: DOT approved "Z" or "W" rated tires are required. Should not more than two years old.

    D. Super Sport Division: DOT approved "Z" or "Y" rated or approved racing tires are required. Should not be more than two years old.

    E. Unlimited Division: Approved racing tires are required.

    F. Unlimited class cars may use Pirelli P-Zero tires only on vehicles with a top speed not exceeding 217 mph.

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    • 3. Racing Tires: Because racing tires do not have load or speed ratings, those who wish to use such tires must submit the type of vehicle, the top speed, and the intended tire sizes for pre-approval.

    NASCAR Safety Inner Tire type tires are recommended for the Super Sport Division and highly recommended for the Unlimited Division.

    4. Requirements:

  • A. In any speed category, tires or wheels may not rub on any part of the suspension, frame, or bodywork.
  • B. Tubes will not be allowed in tubeless tires in any class.
  • C. Valve stem caps, made of metal, with "O" ring seats, are mandatory.
  • D. It is recommended that DOT approved street tires be shaved to a racing tread depth.
  • E. Tires must be in excellent condition and suitable for sustained use at the car's maximum speed.
  • F. The use of repaired tires in Grand Sport, Super Sport, and Unlimited Divisions is not recommended.
  • G. So called "R" compound DOT street legal tires are recommended in all Divisions, except Unlimited, provided they meet all other load and speed requirements.
  • H. It is highly recommended that tires used within 10 mph of their maximum speed rating should be shaved to 4 or 5/32".
  • I. Tires must be mounted on wheels of proper width as listed by the tire and wheel manufacturer.
  • J. Tire Speed Rating Information: The following information is made available to the participant in order to assist their preparation.
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    • Q= 100 mph R= 106 mph S= 112 mph T= 118 mph
    U= 124 mph H= 130 mph V= 149 mph Z= 149 mph+
    W=168 mph Y= 186 mph     

    NOTE:

     Some people have inquired about using racing tires in lower speed classes, we believe that in most cases this could be overkill. Given that racing tires are far more susceptible to puncture, we would recommend using an appropriate street tire. We see no reason, however, to disallow the use of racing tires in lower divisions.

     

    Contact the Tire Consultant concerning alternative tire ratings.

     Please call the Tire Consultant with these or any further questions.

     Tire Consultant: Eric Pettersen

    Phone (510) 462-8417 (Pacific Time in the Evenings Please)

     

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    8/9/98 9:43:44 AM