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Tire rules and approved tires for every racing class
The Briggs & Stratton LO206 is the most accessible karting class in North America. Using a sealed, spec four-stroke engine, LO206 emphasizes driver skill over equipment spending. It is the recommended entry point for new racers.
The KA100 is one of the most popular sprint karting classes in the United States. Featuring a direct-drive 100cc two-stroke engine, it offers an affordable and competitive entry point to national-level karting.
The IAME X30 is a 125cc TAG (Touch-And-Go) class used in professional sprint karting worldwide. The X30 engine package is known for its reliability and close competition, making it a staple of national series like SKUSA Pro Tour.
Rotax Senior is the flagship class of the Rotax Max Challenge, the world's largest kart racing series. Using the sealed Rotax 125 Max engine, it provides close, competitive racing with controlled costs. The series runs globally with national championships feeding into the Rotax Max Challenge Grand Finals.
OK (formerly KF) is the premier direct-drive sprint kart class sanctioned by the CIK-FIA. It represents the highest level of single-speed karting and serves as the primary development class for young drivers aspiring to reach Formula racing.
Rotax Junior is the development class for young drivers aged 12-15 in the Rotax Max Challenge. It uses the same Rotax 125 Max engine as the Senior class but with a restrictor to reduce power output. The class is the primary pathway for junior drivers to progress into Rotax Senior competition.
OKJ (OK Junior) is the CIK-FIA junior sprint class for drivers aged 12-15. It uses a restricted version of the OK direct-drive engine and the Bridgestone YKJ spec tire. OKJ is considered the most important development class for aspiring professional racing drivers, with graduates including multiple F1 world champions.
KZ is the premier shifter kart class, featuring a 125cc two-stroke engine with a six-speed gearbox. KZ karts can reach speeds over 160 km/h and represent the ultimate in kart racing performance. The class is sanctioned by CIK-FIA at the international level.
Rotax DD2 is the premier gearbox class in the Rotax Max Challenge, featuring a 125cc two-stroke engine with an integrated two-speed gearbox. It offers the thrill of shifter kart racing within the controlled-cost Rotax ecosystem, making it accessible to a broader range of competitors.