Hoosier A3S05

The Sports Car D.O.T. A3S05 Radials are Hoosier's DOT-legal Competition tires developed for drivers who compete in autocross, time trial & hillclimb events in dry conditions where providing high levels of grip at lower operating temperatures is desirable. Although 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.

Compared to Hoosier's previous A3S04 tires, the A3S05 radials’ performance improvements were achieved by using a new tread compound that Hoosier's testing in dry conditions has shown will provide enhanced dry traction & improved steering response, while retaining equivalent wear.

Offering the same physical dimensions, the Hoosier A3S05 tires are equivalent in weight to the A3S04 tires & are expected to benefit from the same chassis setup. While the same 120- to 140-degree Fahrenheit operating temperature range as the A3S04 tires is anticipated, A3S05 radials are expected to reach that range quicker in cooler ambient temperatures.

The A3S05 tires feature a symmetric 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 A3S05 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 new tires will feature an attractive, graphic sidewall design with black letters & include a "rim recess" design on all sizes.

NOTE: While the A3S05 tires have an inflated shape with relatively round shoulders to complement camber-challenged cars, they still benefit from vehicle alignments that offer significant negative camber.