The Hoosier R3S03 & A3S03 radials are
Hoosier's latest generation of DOT legal competition tires. The
R3S03 (Racing) tire features a tread compound suitable for track &
road racing applications, while the A3S03 (Autocross) tire features
a tread compound tuned for autocross competition. The Hoosier R3S03
& A3S03 are the lightest of the DOT legal competition tires.
All Hoosier Sports Car DOT radials have
passed DOT requirements but have a special tread compound to
facilitate racing. Due to this special compound, these tires are not
suitable for highway use as the expected miles of wear of these
tires is greatly reduced.
The R3S03 & A3S03 tires feature an
asymmetric tread design (which looks directional, but isn't) & can
be used on either side of the car. They are molded with a tread
depth of just 4/32" so they will not require shaving for
competition, however they will benefit from heat cycling before
competition to enhance wear & provide more consistent performance.
The R3S03 & A3S03 have a symmetric
internal construction that features nylon cord radial carcass plies
reinforced by two fiberglass belts & a circumferential nylon cap
ply under the tread. While the R3S03 & A3S03 have an inflated
shape with rounded shoulders to better compliment camber challenged
cars, they still benefit from vehicle alignments that offer
significant negative camber. Be sure to read Hoosier Tire Care Tips
for advice on the use of these tires.
Hoosier R3S03 & A3S03 tires feature
black sidewall styling with subtle black letters. They are Z-speed
rated & available in 60-, 55-, 50-, 45-, 40, 35- & 30-series
sizes for 13" to 18" wheel diameters.