Tire Care and Safety Guidelines
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Hoosier R6 & A6
TIRES DESIGNED FOR CHAMPIONS
NOT FOR HIGHWAY USE: All Hoosier Racing Tires including DOT labeled Hoosier Racing Tires are designedfor motorsport competition purposes only on specified racing surfaces and are not to be operated on public roadways. DOT labeled high performance Hoosier Racing Tires meet Department Of Transportation requirements for marking and performance only and are NOT INTENDED FOR HIGHWAY USE. It is unsafe to operate any Hoosier Racing Tire including DOT tires on public roads. The prohibited use of Hoosier Racing Tires on public roadways may result in loss of traction, unexpected loss of vehicle control, or sudden loss of tire pressure, resulting in a vehicle crash and SERIOUS PERSONAL INJURY OR DEATH.
TIRE TEMPERATURE RECOMMENDATIONS
For best performance the expected temperature range will vary from track to track. Generally, optimum traction will be generated when the pit lane temps show 180-200 degrees for the R6 in road race applications, and 110-140 degrees for the A6 in an Autocross application.
CHASSIS SETUP RECOMMENDATIONS
For optimum performance the Hoosier radial tires require about 3 degrees of camber. There will be a trade off in maximum performance to maximize wear. Generally, 1/2 degrees less than optimum will result in the best compromise for wear and speed. Less than 2.5 degrees can result in excessive wear on the shoulder junction. The Hoosier tires typically offer better performance with spring/shock rates higher than previous brands you may have run like Yokohama, Michelin, Hankook, Nitto, or Toyo.
TIRE PRESSURE RECOMMENDATIONS FOR COMPETITION
1800-2200 LBS: Hot: 30-33+ / Cold: 22-27
2200-2600 LBS: Hot: 31-34+ / Cold: 23-28
2600-3000 LBS: Hot: 33-37+ / Cold: 23-28
OVER 3000 LBS: Hot: 34-39+ / Cold: 23-29
Higher pressures will improve the performance capability but will require a more sensitive feel to take advantage of the increase. One characteristic of the tires is the tendency to “skate” initially (when inflation pressures are correct). It is important to resist lowering the pressure to attempt to eliminate this feeling. Dropping the pressure too far may improve the “feel” of the tire however it will also lower the performance and increase the wear rate.
Banked Oval / Road Courses
On these type of race course configurations, tires on the loaded side wheels should be elevated four (4) psi (hot) above the normal road course pressure recommendations.
For autocross applications, your starting pressure for the first run should be within 1-2 psi of the recommended hot pressures shown above. After the first run and each subsequent run, keep testing and resetting the pressures back to your target hot pressures before taking the next run. This way your tires are at the proper pressure during the bulk of every run you take.
Factors that can radically affect your pressure set up would include front wheel drive, independent rear suspension, rear engine, and McPherson vs. control arm front suspension.
Front Wheel Drive
Vehicles configured with FWD are probably the most difficult application for a high performance tire setup. The combination of steering, braking and accelerating on the front tires, combined with higher corner weights for the front positions produce a harsh test environment for the race tire. These vehicles will typically have a strut type of suspension that limits camber gain. All these factors result in conditions that require the performance tire to do more work than a simple chart of test pressures can accommodate.
In severe cases front tire pressures for FWD vehicles can run in the 48-52 psi (hot). In cases where the tire size is limited to a relatively small tire, the required pressure can run even higher. The front to rear pressure differential on FWD cars can have extreme ranges of inflation, depending on the driver preference, suspension tuning, and track configuration.
Independent Rear Suspension
With IRS and proper geometry up front,performance tire pressures can be reduced from the recommendations listed above. When there is adequate camber gain and good roll control, the Hoosier performance tire will perform very well at the reduced air pressure. This results in a bigger “sweet spot” and easier control at the limit. When tuning at reduced pressures use the following formula to determine the minimum safe pressure: Divide the total vehicle weight, including fuel and driver, by 100 to arrive at the minimum safe pressure. Example: Your car weighs 2750 lbs. as raced. The minimum safe (cold) pressure is 27.5 psi. Extreme care should be taken when tuning at reduced pressure. Tire damage can occur that is not visible to external inspection.
Vehicles equipped with independent rear suspension (IRS) have a distinct advantage over non-IRS cars when using performance or race tires. This is true for two reasons. First, it is possible to setup some amount of static negative camber on IRS suspensions, if needed. Second, the IRS geometry can provide the proper camber gain to achieve the dynamic camber needed for a radial tire. This is a great benefit because it then becomes possible to better test front tire grip when the rear of the car can be optimized closer to the tire’s performance potential.
NO WARRANTY POLICY
HOOSIER DIRECT .COM AND HOOSIER RACING TIRE CORP. offers racing tires for sale only upon the conditions and the terms contained in this disclaimer of liability and indemnity. Due to many varied and different performance conditions which Hoosier Racing Tires are exposed and because of the manner in which racing is conducted, Hoosier Tires Direct .Com and Hoosier Racing Tire Corp. makes absolutely no warranty, expressed or implied, as to the fitness for a general or particular purpose or of merchantability in connection with any offer of sale of Hoosier Racing Tires.
“HOOSIER RACING TIRES ARE SOLD AS IS.” Race tires are not tested or labeled to meet FMVSS 109, 119, 139 or ECE36 Safety Standards. Therefore it is dangerous and illegal to sell race tires for use on public highways.
SERIOUS PERSONAL INJURY OR DEATH. For more information read tire labels, follow manufacturer’s warnings as molded in tire sidewalls and visit hoosiertire.com.
Old tires can fail in use, causing loss of vehicle control and personal injury. Environmental conditions like temperature extremes, exposure to sunlight, electric arc, solvents, automotive fluids, and atmospheric pollutants accelerate the aging process. Hoosier Racing Tire strongly recommends that new (sticker) tires should be put in service within 2 years of date of purchase. Used (scuffed) tires have a shorter service life than new (sticker) tires. Poor storage and infrequent use accelerate the aging process and reduce the tires performance.
THINGS TO CONSIDER
These tires are molded to their designed tread depth. They do not require shaving to be prepared for competition use. Due to extremely light construction, Hoosier track tires have a much lower polar moment than other performance tires. This translates to a very low rotational mass, which is a good thing for performance applications. The down side to this feature is that the tires do not resist “spikes” in braking force as well as a heavier tire might. As a result, there is a tendency for drivers to “flat-spot” a tire the first time really getting to the limit. Vehicles equipped with ABS will benefit from its use. If you do not use ABS it is recommended that you make an effort to minimize stabbing the brakes until you have some experience with the feel of the tire under hard braking. The light construction also provides less protection from impact damage and punctures. Off course excursions or running over debris on the track will likely result in tire damage. Once some wear has occurred it may be desirable to flip the tire on the wheel in order to even out the wear and maximize tire life.
Wheel width dramatically affects wear and performance of the Hoosier P-Metric radial tires. There is about a one inch window of optimum width. The trick is to figure out that window. A good rule of thumb to use for determining proper width is to use the tread width of the tire. Measure the tread width. Plus or minus 1/2 inch from the tread dimension will indicate the proper rim sizing. It is possible to use narrower wheels, but at a sacrifice to shoulder wear and cornering power.
“Measured” rim vs. “Recommended” rim
In our printed product catalog and on our website tire specifications you will see two columns of information regarding rim dimensions. In most cases, the “measured rim” and the “recommended rim” will be the same. However in the case of DOT tires, the information may appear contradictory. The reason for the differences lies in the Department of Transportation requirements for publishing tire dimensions on any tire that carries a DOT certification. Each tire size has a specific rim that must be used when taking measurements for tire comparison. This is intended to allow consumers a consistent way to compare tire sizes between brands. With respect to the Hoosier P-Metric line, the recommended rim size will typically be wider than the DOT standardized wheel. The fact that a tire will “fit” on a rim is not an indication that it will work effectively in that condition. Radial tires are extremely sensitive to wheel widths. The performance characteristics of the tire can change significantly within the recommended range of application. Mounting a tire on a rim that is outside of the recommendation is not a good idea.
Driving style has also shown to significantly effect tire wear. Drivers who achieve their speed by “tossing” the car run the risk of increased tire wear. Radial tires develop their highest cornering power at relatively low slip angles. Smooth, tidy driving yields faster lap times and better tire wear. The braking feel of the Hoosier R6 tire is very vague at the threshold. This is particularly true for “sticker” tires. Drivers need to develop a sensitivity for the limits under braking. This takes time and practice. Failure to apply this will result in flat-spotted tires. Particular care needs to be taken when selecting brake pad compounds. It is possible to have a pad that is too aggressive. This will make it very difficult to develop good braking feel for threshold braking.
The Hoosier D.O.T. performance tires are extremely good in dry conditions, however they do not make very good wet weather tires. Having dedicated rain tires available will be necessary for your team to be properly prepared. Hoosier makes a D.O.T. approved bias-ply and radial H2O performance “wet” condition tire that has proven superior to offerings from Yokohama, Michelin, Nitto, Toyo, or Hankook. Check with Hoosier Tires Direct .Com for size availability. Hoosier Racing Tire also offers a D.O.T. Radial Wet tire. This tire has a molded tread of symmetrical design. Check with Hoosier Tires Direct .Com for the available sizes. The compound for these tires has been tested and is intended for wet weather use only. When using rain tires, always increase your starting air pressure 2-4 psi over your dry tire starting pressures.
DIRECTION OF ROTATION / MOUNTING INSTRUCTIONS
Rotational guidelines for tires with directional arrows
All Hoosier performance tires having directional arrows must be mounted so that the tire travels in the direction of the arrow. Hoosier race tires having directional arrows will have them on both sidewalls. Directional arrows may not be on a tire that can have both left and/or right side application. All Hoosier track tires not having directional arrows should be mounted as detailed below.
Rotational Guidelines for Tires Without Directional Arrows
Every Hoosier race tire has a four character serial code embossed into ONE sidewall of the tire. All Hoosier DOT tires will also have two additional codes as required by the Department of Transportation. (Example: J7AB 4AX8 3709)
Circle Track Racing Tires (Includes both dirt and asphalt tires)
Hoosier race tires must be mounted with the serial code located toward the infield.
Road Racing Tires
In most cases, Hoosier performance tires used in Road Race applications should be mounted with the serial code toward the center of the vehicle. Once a race tire has been run in the proper orientation it is acceptable to remount the tire in the opposite direction to even out the wear.
Verify Correct Wheel and Bead Flange
All tires are designed to be used on wheels that are manufactured to Tire and Rim Association (T&RA) specifications and tolerances. Some rims are non-standard or damaged and it is necessary to inspect the rim flange to assure proper fit. Consult your specific rim manufacturer to determine if your rim can be used in this application. Never attempt to install and inflate a tire of one bead diameter on a rim or wheel of a different bead diameter. Use of Hoosier Racing Tires on wheels with incorrect bead flanges or wheels that do not meet T&RA standards can cause the assembly to fail and burst with explosive force sufficient to cause SERIOUS PERSONAL INJURY OR DEATH. Use a certified wheel rim disk tape to confirm wheel rim flange size.
Special Tire Mounting Instructions
Only trained personnel using proper tools and procedures should do performance tire mounting. Failure to follow safe mounting procedures could cause faulty positioning of the tire and cause the assembly to burst with explosive force sufficient to cause SERIOUS PERSONAL INJURY OR DEATH. Always inspect tire for kinked beads or other possible damage that may have occurred in shipping or storage. Clean rim and lubricate beads with rubber lubricant. Always lock rim on mounting machine or place in safety cage. Use a clip on chuck, an in-line valve with a pressure gauge or adjustable regulator and remote inflation/deflation device. Have enough air hose to stay out of the trajectory.
When seating beads never exceed maximum bead seating pressure as molded in tire sidewall. Never exceed manufacturer’s maximum inflation pressure. Always seat beads with wheel locked to mounting machine or placed in a safety cage. A damaged tire or wheel can fail during bead seating and burst with enough force sufficient to cause SERIOUS PERSONAL INJURY OR DEATH. Have enough air hose to stay out of the trajectory. Stand back. If the beads will not seat at the manufacturers maximum bead seating pressure, STOP, deflate tire, return the tire to the place of purchase.
Chemical Treatment of Tires
Hoosier Racing Tires strictly forbids any chemical alteration of the tire carcass and/or tread compound such as tire “soaking” or use of tread “softener.” Hoosier Racing Tire strictly forbids the physical defacement (removal, altering or covering), of tire sidewall markings in any manner. Failure to comply with this warning could result in premature or catastrophic tire failure and may result in SERIOUS PERSONAL INJURY OR DEATH.
All Hoosier Racing Tire products are designed for a specific purpose. Consult with Hoosier Racing Tire Corp. for specific fitment and application. Utilizing Hoosier Tires in any form outside of their intended use constitutes misuse of the product and can cause SERIOUS PERSONAL INJURY OR DEATH. Hoosier Racing Tire products are designed and manufactured for racing purposes only, within a closed course designed for organized competition. Not for recreational use. Hoosier Tires should never be used for Off Track Exhibition or for Land Speed Record Vehicles including Jet or Rocket Powered Cars.
Freeze Crack Advisory
This advisory addresses proper storage and use of Hoosier tires in cold conditions. Hoosier Tires, especially asphalt and hard compound tires, may experience Rubber Cracking if the tires are transported, crushed, flexed or stressed when frozen. The following guidelines are provided to avoid this problem;
1. Always store Hoosier Racing Tires indoors at temperatures above 32˚ F.
2. If tires have been subject to 32˚ F or less, allow them to warm to room temperature (about 70˚ F) for a minimum of 24 hours before the tire is mounted, transported or flexed.
3. Always use spare tires not intended for future competition to store vehicles for prolonged periods of time or winter transport.
4. If below freezing temperatures are expected, please consider shipping tires once more favorable conditions exist. Do not use tires that have evidence of Freeze Crack Damage.
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