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Tire Regulations
Load Carrying Capacity: All tires must have an equal or greater load carrying capacity than the original tire. (Example: Suppose the base tire for a 1999 Mustang is a P205/65R15 rated @ 1400 lbs. Any replacement tire must have a load rating of at least 1400 lbs., regardless of the speed rating or Division/Class in which the vehicle is competing).
Speed Rating: The car must be equipped with tires having a speed rating equal to the OEM specification (or higher) of the car to compete in any class, including Touring). In addition to the Load Carrying Capacity requirements listed above, the tires used must have a speed rating equal to the top speed of the vehicle as determined by its current configuration.
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/ZR" rated tires (or better) with “W” suffix (168 mph) are the minimum standard. DOT “Y” suffix tires (186 mph) are highly recommended and required for GS6. (Y) (parentheses) tires (186+ mph rating) are highly recommended if available.
D. Super Sport Division: DOT approved "(Y)" rated (186+ mph) or approved racing tires are required. Inner liners for NASCAR-type racing tires are highly recommended.
General 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. These are available at any auto parts store.
D. Tires must be in excellent condition and suitable for sustained use at the car's maximum speed in the event. They should not be more than 4 years old. However, we are aware that newly purchased tires can sometimes be 1 or more years old at the time of purchase. If your tires fall into this category, please consult with the Chief of Tech before taking any action.
NOTE: The tire production date can be found inside a small oval stamp on the inside sidewall. It is usually a 3-digit or 4-digit number indicating the week and year of production. For example, if the number is “349,” the tire was produced in the 34th week of 1999. If the number is “1302,” than the tire was produced in the 13th week of 2002. You will be asked to provide these dates on your Tire Inspection Form in your entry packet. PLEASE contact us if you have any questions, and we will help you.
E. The use of repaired tires is not permitted. Tire failures are the #1 cause of open road racing accidents, so consider your tire condition very carefully!
F. Tires must be mounted on wheels of proper width as listed by the tire and wheel manufacturer.
G. Tire Speed Rating Information: The following information is made available to the entrant in order to assist their preparation.
Q= 100mph R= 106mph S= 112mph T= 118mph
Note: Q, R, S and T tires are not permitted in any class!
U= 124mph H= 130mph V= 149mph Z= 149mph+
W= 168mph Y= 186mph (Y)= 186+ mph
Note: Some people have inquired about using racing tires in lower speed classes. 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, but strongly recommend that extra care be taken when using such tires. Please call the Chief of Tech with these or any further questions.
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