Hoosier R3S04

Hoosier's R3S04 & A3S04 radials are DOT-legal Competition tires developed for drivers to use during dry track conditions. While Hoosier Sports Car DOT radials meet DOT requirements, they are not suitable for highway use as the expected miles of wear from their racing tread compounds is greatly reduced.

The R3S04 & A3S04 radials’ performance improvements were achieved using Hoosier’s new engineering, construction & process techniques to produce tires that provide linear "turn-in" response, increased lateral traction & cornering speeds, as well as a substantial improvement in consistency & wear.

The R3S04 (Racing) tire features a tread compound focusing on track & 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 & horsepower of their vehicle, as well as to the track & temperature conditions in which they will be running. Heavy vehicles, high horsepower, demanding tracks & warm ambient temperatures will probably require the use of R3S04 tires while light vehicles, low horsepower, less stressful tracks & cooler ambient temperatures may allow the use of the A3S04 tires.

The R3S04 & A3S04 tires feature a symmetric tread design utilizing a "slick" tread surface with two "Formula One" style circumferential tread grooves. This allows them to be mounted on either side of the car (& later be remounted "inside-out" to further extend their life). Beginning with a tread depth of 4.5/32", they will not require shaving for competition, however they will benefit from heat cycling before competition to enhance wear & provide more consistent performance.

The R3S04 & A3S04 radials feature a symmetric internal construction that uses nylon cord radial carcass plies reinforced by two lightweight steel belts & a spirally wrapped circumferential nylon cap ply under the tread. The Hoosier R3S04 & A3S04 tires are slightly heavier than the R3S03 & A3S03 tires they replace (typical increase in weight is approximately .5-pound on smaller sizes up to 1.5-pounds on larger sizes), & remain the lightest of the DOT-legal competition tires.

Hoosier R3S04 & A3S04 tires feature an attractive, graphic sidewall design with black letters & include a "rim recess" design on all sizes. They are Z-speed rated & available in 60-, 55-, 50-, 45-, 40, 35- & 30-series sizes for 13" to 18" wheel diameters

NOTE: While the R3S04 & A3S04 have an inflated shape with rounded shoulders to complement camber challenged cars, they still benefit from vehicle alignments that offer significant negative camber.