The Hoosier A6 and R6 are two of the most successful DOT-legal racing tires in recent years. A6 and R6 tires look identical, but are designed for different types of competition. How do you know which is best for your vehicle?
The Hoosier A6 was developed with autocross competition in mind. It uses a softer compound for maximum grip and comes up to temperature more quickly to reach optimal grip between 110 and 140 degrees Fahrenheit. A6 tires deliver more traction, but give up longevity to do so. In autocross, where runs are extremely short, this lack of longevity is not a problem and allows a set of A6 tires to last for multiple events. Though the tires are generally ready to run when brand new, a light scuff-in can be beneficial.
Hoosier R6 tires are designed for roadrace competition. They have a more durable compound that's better able to hold up to multiple lapping sessions, higher speeds and larger race courses. The R6 should be heat cycled before competition use for the most consistent performance. Tire Rack offers heat cycling service for competition tires. With this service, the tires arrive ready to use.
Some drivers will also use the A6 on road courses for sprint races or qualifying sessions where a few fast laps are of the utmost importance. Used in this way, the A6 will often be used up in one session. Using the A6 in a roadrace setting is only recommended for experienced drivers who know exactly what they need and are willing to go through a set of tires in one event. Lightweight vehicles with moderate horsepower may also use the A6 in cooler weather when they're not able to get the R6 up to the optimal temperature range of 180-200 degrees Fahrenheit .
Drivers preparing to run Hoosier tires on the track should also read Hoosier's care and feeding document.