What makes up the RC off road tire.How the RC off road tire works.
The off road tire has some sort of tread pattern, ordinarily with pins. There is a huge selection of different shape, size and pin pattern. One of the first things to consider when choosing an off road tire is tire compound. Let us take a closer look at each of these compounds. Hard Compound Tires Hard compound tires are a good choice when you are running on a very soft surface. Examples of these surfaces are loose dirt, mud, a damp surface or fresh grass. The principle design of these tires are that the tire does not move, but the surface does. Since this type tire has a very stiff side wall they are insensitive to foam insert changes. Medium Compound Tires A medium compound off road tire works very good on most dirt surfaces. If the track or surface you are running on is very dusty, or is starting to break up a medium compound tire is a very good choice. Soft Compound Tires A soft compound tire is designed to work very well on very hard surfaces. If the surface or track has what is called a blue groove condition a soft compound tire would be a good choice. A blue groove condition is when there is a substantial rubber build up making the surface a darkish gray or black. A good general rule to go by is the harder the surface the softer the tire and the softer the surface the harder the tire. So, it becomes very important to learn how to read a track or the surface you are running on. 
Sidebar============================= Reading a track or the surface that you are running is not easy. So, choosing the right rc off road tire for the conditions can be very difficult. Experience is the best teacher when it comes to "reading" a track or surface. Starting off the best thing to do is go and get your hands dirty feeling the track or surface. If the surface feels hard as a rock, with very small grains, it is almost certain you are going to need a soft compound rc off road tire. Even if there is some loose fine dust. In "reading" the track you find it to have a serious "blue groove" (rubber deposit), a medium compound rc tire is probably a better choice. There is no point in using a soft floppy tire, if there is plenty of traction. A soft tire in these conditions will just flop around and bend over too much in these conditions. Causing your rc car or truck to feel very imprecise. If you are going to be racing or running on a surface that is damp, rc tire compound is not that important. The only factors to keep in mind are a soft compound rc off road tire will feel stickier. While a rc off road tire with a medium compound will feel more direct, because the carcass holds it shape better. Things get real difficult when track conditions are changing. If a track is drying up or has hard "blue grooved" sections and soft breaking up sections. Then the only solution is doing back to back testing with different compounds. Then choosing the best tire that suits your driving style. So, reading a racing surface can be difficult. But, it is part of the fun of racing rc cars and trucks. ================================================================ 
Another thing to consider when choosing a rc off road tire is the carcass shape. There are two shapes of rc car tire and rc truck tire to consider when choosing your rc off road tire. These are round and flat. Round Carcass This type of rc off road tire has a rounded contact area. Making them excellent on bumpy, rutted surfaces. This carcass provides consistent traction. It will not hook into ruts and make the car or truck flip over. A rounded rc off road tire carcass is not sensitive to camber changes at all. The only downside to this kind of carcass is that it does not generate as much forward bite. Flat Carcass This rc off road tire has a flat or almost flat contact area. These tires provide excellent forward bite. A flat carcass is very sensitive to camber. If camber setting is correct they have excellent cornering traction. The downside to a flat carcass is that they only like smooth surfaces. On bumpy surfaces this type of rc tire will feel very inconsistent and can make your car or truck flip over easily. Learn how to Glue Tires like a Pro
One other thing to keep in mind when choosing your rc off road tire, is rim or wheel size. There is not many options in this area. Some of you might be able to use a little taller rim. For instance a 2.0 inch tire on a 2.2 inch rim. Doing this stretches the side wall a little making the tire stiffer and flatter. When this is done correctly, it can make your rc off road tire feel a little more responsive and sure-footed, but it could loose some performance on bumps. But, if you over do this your rc off road tire will be bent out of shape and traction is very poor. What seems to be the "in" thing to do now is use a slightly wider rim. Using a wider rim on your rc tire stretches the carcass. Making the tire lower, wider and more firm. This makes the rc off road tire feel more direct and a little better on smooth tracks. One of the factors to consider is the size and shape of the pins. The pins vary in size from "mini" to long, and from thin to stubby. Each one of these kinds of pins performs differently on different surfaces. Choosing the right combination is critical to your performance no matter what kind of surface you are running. 
The shape of the pins is also an important factor. The shape of the pins on your rc tire, also has a big influence on the handling and performance of your rc truck or car. The shape of the pins can vary from thin, stubby or blocks. The thin and stubby pins are cylindrical in design, while the block pins are square or rectangle in design. While even some can be a combination of these. At the base of the pin it could be thick and stubby or a block, while the point is a cylindrical pin. This type of pin is called a "Step Pin". The pin density (number of pins on a given tire width) on a rc tire play a big factor on how your rc truck or car reacts on different surfaces. The smaller the pin density the more weight is supported on each pin. While the reverse effect happens on a higher pin density tire, less weight on each pin. So, choosing the correct pin density can greatly influence the performance of your rc truck or car. The combining of pins and density can make these tires directional. So take extra care needs to be taken when gluing these tires up. You do not want the left side going one way and the right the opposite. If you need more information on gluing up tires check out the section on tire gluing. What Foam Inserts do I Run? Need to know Click Here.
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The last big variable with a rc off-road tire is the tread pattern. There are many factors that come into play as far as this goes. 
To make matters even worse is the alignment of the pins, the tread pattern. There are some rc tires that have both a combination of different pins and a combination of pin density on a tire. 
