<font face=\"Verdana, Arial\" size=\"2\">The R3S04 (Racing) tire features a tread compound focusing on track and road racing applications, while the A3S04 (Autocross) tire features a tread compound focusing on autocross competition. The availability of both compounds also allows drivers to match their tread compound's capabilities to the weight and horsepower of their vehicle, as well as to the track and temperature conditions in which they will be running. Heavy vehicles, high horsepower, demanding tracks and warm ambient temperatures will probably require the use of R3S04 tires while light vehicles, low horsepower, less stressful tracks and cooler ambient temperatures may allow the use of the A3S04 tires.</font>