Ever since radial tires with stiffer sidewalls have been used, changing the air pressure within the tires is used as another setup tool when adjusting spring rates in the vehicle´s suspension. If the air pressure is increased, the "spring rate" in the tire will raise. This changes the car´s handling characteristics. For example, if the racecar is "tight" coming off a corner, the driver might request a slight air pressure increase in the right rear tire to "loosen it up."

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