In motorsports, a tire war occurs when more than one manufacturer provides tires for a motorsports series. Historically, tire wars have occurred in many high-level series, such as Formula One, NASCAR, Super GT, and MotoGP.
Tire wars are a controversial practice: on the one hand, they promote technical innovation, forcing tire manufacturers to "push the limits" of their tire manufacture. On the other hand, when all event competitors plan to stretch their tires' performance envelope, the event risks widespread tire failures that can reduce driver safety; such a scenario occurred at the 2005 United States Grand Prix.[1][2]