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
Hoosier's previous A3S04 tires, the A3S05 radialsí 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
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.