Dirt on Tires: The Top 10 Off-Road Destinations in the U.S.
Durable, Dependable, Trusted.Three decades of improvements and advanced manufacturing technology have made our tires last competitively longer than other tire brands. Maxxis Kart Tires are reliable for any track, surface, and condition. From novice to veteran drivers, you can trust Maxxis Kart Tires to lead you to victory.
The ST3 is another version of the champion-winning HT3 tire that has dominated dirt oval karting since 2010. Using the same design as the HT3 tires, this tire is a great option to use on a track surface that is soft or slick.
dirt on tires
Working alongside Maxxis, Goldspeed USA strives to provide high quality kart racing tire products. We are committed to providing excellent customer service to the karting industry and consistently exceeding customer expectations. Our continued research and development of Maxxis kart racing tires has proven that we are the best in the kart racing industry, supported by the long list of champions who trust Maxxis tires.
QUESTIONS:1. What is the number written on my bias race tire in yellow chalk?2. Explain the use of Bleeder Valves.3. How do Hoosier Open Wheel Dirt Compound Codes compare to the competition's codes?4. What are some of the guidelines for Grooving and "Siping" Late Model dirt tires?5. Does it matter which direction I mount my Hoosier race tires?6. What's the difference between grooving and siping my Hoosier dirt tires?7. What are the do's and don'ts when storing Hoosier race tires at the end of the racing season?8. What are the recommended operating temperatures of Hoosier sprint tires under various track conditions?9. IMCA Air Pressure Siping & Grinding Tips10. How do I groove and sipe my right rear sprint dirt spec tires?11. How do I groove and sipe my northeast modified dirt tires?
ANSWERS:1. What is the number written on my bias race tire in yellow chalk? As a result of a tire being bias in design (as opposed to radial), it will have a circumference that varies from tire to tire. This is not something that is unique to Hoosier but is common to all bias tire manufacturers. However, Hoosier has went to the expense of placing a "chalk-mark" on its bias ply tires in an attempt to assist the consumer in making the proper selection when purchasing new tires. It is something Hoosier does that our competition does not. Now, to understand its use, you need to understand a little of the manufacturing process as well.After a tire is cured, it is removed from the press and placed on a machine called a "post-inflator". On this machine each tire has air injected into it for a set period of time. The amount of air is determined by our engineering department and is not the same for every type of tire Hoosier produces. After a set time period, a tire is then measured and the circumference is recorded. Then a press operator writes the size on the side of treaded tires and on the tread of slicks, in yellow chalk. All Hoosier bias ply tires with a chalk-mark, follow this same process.Now, how should the chalk mark be interpreted? It should be viewed as a reference point or a guide on purchasing tires by size to attempt to attain a certain stagger. Say for instance, you needed to replace your right front tire. Your car currently has 1" of stagger (with the RF @ 28 p.s.i.) but you want to get 1 1/2" of stagger. The tire you were replacing had an original chalk mark of 86", and had a roll out, of say, 85". Obviously, you would want to purchase a tire bigger than the 86" tire you removed. Most likely, a tire with a chalk-mark of 86 1/2". You have to remember there are many factors that go into what size a tire will actually measure. The ambient temperature that day, the air pressure in the tire, whether the tire is new or old. These are factors that no, one person, controls. You just need to be aware of their existence and work with what you know. The chalk mark does not tell you the circumference of the tire at running pressure, it does not tell you how big a tire will grow to, it tells you that a tire is either going to be bigger or smaller than another one with a different chalk mark. It's just that simple. Bias ply tires, by nature, are going to vary in size, whether you buy a Hoosier or the competition's tire. By keeping good records, using common sense and understanding how the chalk-mark Hoosier tires provide, you will be step ahead in selecting the proper sized tire(s).
2. Explain the use of Bleeder Valves.General NotesWhile racing you may see that your rear tire stagger may tend to change in an unfavorable manner (while using bleeders). It may seem to be unpredictable and uncontrollable. With careful bleeder valve Set Point Management, one can effectively minimize size control problems.Main Reason Tires May Change SizeA common problem is to see the LR tire grow while the RR tire shrinks. This tendency occurs because the RR tire runs hotter than the LR tire, causing more air pressure gain, causing the RR bleeder to relieve more pressure (volume) than the LR bleeder.Bias ply tires will change size when the air pressure changes. The higher the pressure, the bigger the tire. As a rule of thumb, the size change is linear with air pressure. A 10 psi change will either make the tire 1" bigger or 1" smaller (circumference). Each PSI is worth a .1" change in size.Realize the use of Bleeder Valves limits the air pressure gain, but does not keep the pressure from lowering if the tire is allowed to cool. This is typically what happens during a caution period. This is when many will notice trouble with their race car handling. Why? There is no system to replace the lost air pressure.
Bleeder Valve Recommendations:1) Use Bleeder Valves to REDUCE the air pressure buildup, not eliminate it:Bleeders should not be used to maintain a constant air pressure. You must always set the bleeder higher than the starting cold air pressure. If your tires cool (caution period), the inflation pressure will be reduced by the amount of pressure the bleeder valve bled off. It is normal to see 7-8 psi of RR buildup (without bleeders). If the bleeders kept the RR tire at a constant pressure hot (no buildup), your car will lose .7 to .8" of stagger if the tires are given time to cool. This is not due to RR tire shrinkage, this is due to LOW AIR PRESSURE. You may be compromising driver safety.2) Recommended Initial Bleeder Valve Set Points:LEFT REAR: + 3 psi over coldRIGHT REAR: + 4 to + 6 psi over coldLEFT FRONT: bleeders generally not needed due to lack of tire heatRIGHT FRONT: + 5 psi minimum if used
As part of its strategy to boost interest in the 2021 NASCAR season, series officials and teams agreed to run one race this year on a packed dirt surface that's quite common among lower-tier, regional racing series. Sunday's race was postponed to Monday due to flooding.
Bristol Motor Speedway, site of the race, is a paved 1/2-mile banked oval; for this one-off event, the track hauled in 23,000 cubic yards of dirt over several weeks in January and February and used Global Satellite Positioning (GPS) equipment on the bulldozers and graders to ensure it was laid down properly.
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There is nine to 10 feet of dirt in the corners for a 19-degree banking and one to two feet on the front and backstretches. The racing surface on the track will be about 50 feet wide, according to Steve Swift, senior vice president of operations and development for Speedway Motorsports, the track's operator.
The leading edge of the blocks bite into the dirt and the grooves in the tread help evacuate the dirt, Goodyear said. The also has been widened to 11 inches, versus 10 inches on tires for modifieds, to give the NASCAR cars and trucks more grip.
A key reason for using bias-ply tires, according to Greg Stucker, Goodyear's director of racing, is that bias tires don't have belts under the tread area and thus are more "compliant" and able to conform to irregularities of the dirt surface. In addition, the tires designated for mounting on the cars' left, or driver, side are significantly shorter to build in more stagger between the left- and right-side tires.
Goodyear began transitioning from bias play to radial tires in NASCAR competition in 1989. None of the current Cup Series drivers has run a bias-ply tire in a Cup series race previously, Mr. Stucker noted.
Legendary Firestone Dirt Track tires cut their teeth on the dirt tracks of America and quickly became popular on hot rods. Today many of the finest examples of traditional hot rods in the world wear these popular tires as tribute to the original hot rods and dry lakes racers of the late 1940s and 1950s. Choose from several sizes to get the perfect hot rod stance and rake. Firestone Dirt Tack tires are available in sizes from 5.00-12 to 8.20-19 including new 11.00 sizes.
This adhesive type of friction creates the gobs of rubber that build up on a tire after a run. Drivers on old tires swerve before a restart partly to scrape off the rubber gunk and expose a clean surface that will provide better friction.
All of these friction mechanisms allowed cars to make about 20-second laps on dirt at Bristol last year. The 2021 lap times at pavement Bristol were around 17 seconds, but the banking of the pavement track (24-28 degrees) was higher than that of the dirt track (18-19 degrees last year).
The only reason I've ever wrapped tires was to keep them clean. When a tire gets ground if it gets rolled in the dirt afterward it will pick up a lot of dirt and debris. If it gets put on the car it's not a problem, but if it gets put back in the trailer then the stuff goes with it and then eventually falls off in the trailer. I've never felt a difference in performance between a tire that was wrapped and one that wasn't.
The wide range of off-road motorcycle tires in the Pirelli catalog includes products offering top performance on any soft, medium or hard terrain, even in the harshest riding conditions.