Hoosier has excellent Dry Racetrack & Autocross Only tires for autocross and road racing events.
The A6 Radials are designed to compete in autocross, time trial and hillclimb events in dry conditions where responsiveness and high levels of grip at lower operating temperatures is desirable. Starting with a tread depth of 4.5/32", they will not require shaving for competition, however they will benefit from a minimal scuff-in prior to their first runs.
The R6 Radials are developed for drivers that compete in road racing events where high levels of grip and responsiveness in dry conditions are desirable. Beginning with a tread depth of 4.5/32", they do not require shaving for competition, however they will benefit from heat cycling before competition to enhance wear and provide more consistent performance.