The shoulder is as important a part of the tire as anything else and if you are going to be running on it due to low air pressure or because you are running against the cushion you need to make the best use of it.

This is typically what happens during a caution period. It is personal preference as to how you get there, realizing that you are changing the car's handling when you adjust air pressures. Hoosier produces a wide range of oval track asphalt tires to run from the ¼ bullrings to Super Speedways that repeats week after week. NOTE: Realize that there are several ways to fix the problem & that all we are doing is changing the gap between the cold air pressure setting and the bleeder valve set point. The sipes can help prevent the shoulder area of the tire from glazing over and losing traction. You have a few options available to you which will fix the stagger.

As a dirt car travels around the track on a given line, the body is actually pointed towards the infield a certain number of degrees. This should allow the RR tire to grow 1/4" also, keeping the stagger (and sizes) the same. From Sprint Cars to Open Wheel Modifieds and Micro Sprints, Hoosier Tire is the industry leader in purpose-built dirt track racing tires.

The number of laps to be run is an important consideration when deciding how to groove your tires. Hoosier makes purpose built bias ply drag slicks and drag radials that are reliable, fast, consistent and affordable from the professional racer to the weekend sportsman at the drag strip. You have to balance grooving with the amount of abrasion or traction available because tracks that generate a lot of heat may also be very abrasive or contain rocks that want to tear the tire up if it is grooved too much. After a set time period, a tire is then measured and the circumference is recorded. Race Length From Sprint Cars to Open Wheel Modifieds and Micro Sprints, Hoosier Racing Tire is the industry leader in purpose-built dirt track racing tires. This tire was designed for use as a left rear for dirt sprint cars and has an approximate durometer reading of 38 at indoor , room temperature. This is the very firm right front tread compound designed for Northeast Style Modifieds and we’re overstocked at this time.

These environments include open competition racing – where extracting the ultimate performance from a tire is paramount, spec tire racing – which is defined by consistency and predictability in performance over multiple race meetings, and entry level / economy racing – a cost containment platform where an extremely durable tire places an emphasis on driver parity. Let’s say you run an initial Bleeder Valve setup & RR comes in 1/4" smaller than it was cold, but the LR stayed the same, in which the net loss of 1/4" stagger is not desired. Bleeder Valve Recommendations: The 110/100-18 is optimal as a rear tire for lower horsepower 125cc and 250cc Off Road bikes in GNCC. diameter is 25.6” | Approx. Hoosier adds new 110/100-18 Motocross Tire. 105/16-15 MED (Extreme Heat, 1/2-Mile Tracks) Hard Tires What's the difference between grooving and siping my Hoosier dirt tires? In addition to enhancing traction, grooving helps the tire dissipate heat and can be used to help control tire temperatures. Racers rarely run soft tires in a race, especially the 100 lap events, but grooving soft tires correctly can be a big help in qualifying or short heats on a wet track. but you want to get 1 1/2" of stagger. Hoosier Tires is the most successful American racing tire company and maintain a commitment to excellence. Hoosier entered the rally market in 2015 and since then has set the standard with its unique sidewall designs that protect rim and sidewalls from impacts. There are three basic shapes used in grooving: square, V, and sipes. These smaller blocks can help a lot when you catch little rough areas on the track. Due to the early success of our new 8” wide, 13” bead size Mini-Stock/Dwarf Car tires, Hoosier Racing Tire has decided to expand their compound offerings leading into the 2020 season. Learning to recognize the amount of wear you can expect from a track not only helps you choose the right compound tire for the night but is important information for deciding what pattern and depth grooving to use. 2. 9. Whether you are sliding on the dirt or hooked to the asphalt, Hoosier Tire has the tire you need. Website Design and Development by Digital Momentum, * Only available in the 69.0/10.0W-10 (Item #42239). It was during these early days that Bob had a vision to produce his own tires specifically designed for racing. Sipes keep the surface wearing and the tire working throughout the race. Along with these factors racers must consider the amount of heat a track puts in their tires. Hoosier provides spec tires to various national and regional series that promote Sprint Car, Late Model, Modified, Midget, Northeast Modified, ATV, Silver Crown, Micro Sprint, and Street Stock Racing. Rim Width: 10-14" | Measured Rim Width: 14" | Section Width: 14.25" | “cold” durometer of 50-54. What is the number written on my bias race tire in yellow chalk? Hoosier tires having directional arrows will have them on both sidewalls.

Any time a groove or sipe is cut into a tire it accelerates wear. LEFT REAR: + 3 psi over cold Directional arrows may not be on a tire that can have both a left and/or right side application. Most likely, a tire with a chalk-mark of 86 1/2". Hoosier‘s full range of 5” tires are designed for specific race environments. If the tire needs a couple of laps before it starts working we may add some grooves or sipes to give the tire a little extra grab until it develops enough heat to work on it's own. At some tracks we will also sipe across the circumference grooves so that we are making little blocks that are more flexible yet. Whether you are sliding on the dirt or hooked to the asphalt, Hoosier Tire has the tire you need.

Grooving the Tread "Shoulders"  Explain the use of Bleeder Valves. Now, how should the chalk mark be interpreted? (see photo) With the large stagger block tread design we can often run that tire with little or no additional grooving, depending on the condition of the track. As a rule of thumb, the size change is linear with air pressure. Hoosier also has a strong international presence in dirt racing in Australia, New Zealand, and Canada. Manufactured in Lakeville, Indiana - Hoosier Tire has spent 11 years manufacturing tires for everything from grassroots 206 to high level shifter karts. This is due to the fact that axle mounted valves are more efficient at bleeding off air pressure gains. Dirt race cars seldom if ever run in a straight line but the driver will try to keep the car much straighter when the track is slick than when there is a lot of bite to work with. Putting an exclamation point on the success of the Engine Pro Sprint On Dirt presented by ARP “beyond limits” format, Hoosier Racing Tire has extended its tire agreement with SOD. What's the difference between grooving and siping my Hoosier dirt tires? Every Hoosier race tire has a four character serial code embossed into ONE sidewall of the tire.



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