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. You just need to be aware of their existence and work with what you know. These are factors that no, one person, controls. The ambient temperature that day, the air pressure in the tire, whether the tire is new or old.
You have to remember there are many factors that go into what size a tire will actually measure. Most likely, a tire with a chalk-mark of 86 1/2". Obviously, you would want to purchase a tire bigger than the 86" tire you removed. The tire you were replacing had an original chalk mark of 86", and had a roll out, of say, 85". Your car currently has 1" of stagger (with the RF 28 p.s.i.) but you want to get 1 1/2" of stagger. Say for instance, you needed to replace your right front tire. 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. All Hoosier bias ply tires with a chalk-mark, follow this same process. Then a press operator writes the size on the side of treaded tires and on the tread of slicks, in yellow chalk. After a set time period, a tire is then measured and the circumference is recorded. The amount of air is determined by our engineering department and is not the same for every type of tire Hoosier produces. On this machine each tire has air injected into it for a set period of time. Now, to understand its use, you need to understand a little of the manufacturing process as well.Īfter a tire is cured, it is removed from the press and placed on a machine called a "post-inflator". It is something Hoosier does that our competition does not. 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. This is not something that is unique to Hoosier but is common to all bias tire manufacturers. What are the do's and don'ts when storing Hoosier race tires at the end of the racing season?Īs a result of a tire being bias in design (as opposed to radial), it will have a circumference that varies from tire to tire. How do I know when it is time to replace my R7/A7 competition radials?Ħ. Does it matter which direction I mount my tires?ĥ. What rim width should I use for my application?Ĥ.
How do I get Hoosier Tire decals for my race car?ģ. What is the number written on my bias race tire in yellow chalk?Ģ.
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