Compounds of tires on the grid for the Grand Prix of the United States 2005. Michelin competition tires belonging to the Formula 1 Renault R25, 2005. McLaren MP4/22 dry with soft tires. The tires are designed to withstand forces far greater than a conventional one, basing its production on the use of nylon, polyester fiber and soft rubber. During the race the tire can withstand more than a ton from the downforce and side forces of 4 g and longitudinal forces of up to 5 g This limits the number of wheels of each car to four, with the possibility to be three axles or twin wheels. In the 1970s, the Tyrrell P34 had four front wheels with a special 10-inch diameter. Part of the rubber tires have accumulated along the track left visible dark spots, usually in the pianos and curve inward and outward.The behavior of the tire is better in a certain temperature range, for example, conventional dry-weather tires, are designed to work optimally between 90 and 110 C. only in that range of temperatures reach its maximum coefficient of adhesion. Each manufacturer provides a recommended temperature for each tire, but do not vary much from those of a conventional dry tire. The tire pressure should be kept as stable as possible to get an optimum pressure distribution in the contact area with the ground. To prevent temperature changes alter the pressure of the gases that contains the wheel, instead of using air using other gases, mainly nitrogen. Atmospheric air contains oxygen and water vapor in the chamber inside the tire, rubber coating oxidized interior that ensures the tightness of the tire.The gas leak inside a tire would lead to a decrease in tire pressure, adding to the pressure distribution in the contact area with the ground while also allowing the tire to heat up faster due to increased friction. The use of nitrogen extends the life of the tire, as well as being flammable. The development of competition tires reached its peak around 1960 with the use of slick tires. But in 1998 the new rules imposed by the FIA forced the teams to use rear tires with a minimum of 4 channels of drawing, and front 3 channels, with a minimum design depth of 2.5 mm and separated by a minimum of 5 cm. These changes created new challenges for manufacturers, who now possessed less grip. Since 2001 Michelin returned to Formula 1 to compete with Bridgestone. Formerly Goodyear and Dunlop also participated in this competition.Following the decision of the FIA to impose a single tire manufacturer in the World from 2008, Michelin announced he was leaving Formula 1 after the 2006 championship. Thus, Bridgestone is the sole tire supplier since 2007 until 2010. There are four types of dry tire compounds (super soft, soft, medium and hard), another rain tires and a fourth type of extreme wet tires. A set of tires is a set of two front and two rear tires of the same type of compound.Since 2007, each driver receives at each Grand Prix two types of dry tires, which are previously selected by the tire manufacturer, and can not use more than 7 games of each type of dry tires, plus 4 sets of wet tires and 3 sets of extreme wet tires. No driver may use more than two sets of each type of dry tires for the first two sessions of training. that provides softer tires Bridgestone each track must have a white line visible to the public. The set only four tires and a supplier is a reduction in the degree of inequality between teams in the tests performed and development costs. Currently allows the tires are inflated with compressed air, nitrogen or carbon dioxide. By using nitrogen reduces the rate of leakage of gas inside the tire, and that nitrogen diffuses through the tire more slowly than air.This allows greater control of the tire pressure, a slowdown in its heating and lower rolling resistance, increasing the efficiency of the fuel. Moreover, by reducing the oxygen concentration reduces the corrosion rate of the rim and tire degradation, increasing its life. See also: List of tire manufacturers in Formula 1