The 18th season for Challenge of the Americas championship is another significant year. It is one of change and expansion, with the program now hosting four events in 2025 while welcoming the new Shinko Racing Kart Tire. The new era begins on January 31-February 2 at the Musselman Honda Circuit in Tucson, Arizona.

Registration for the opening rounds of the Challenge in Tucson is now open. Challenge of the Americas has moved over to the Race Select service for registration in 2025. Visit RaceSelect.comto pre-register for the season opener at the Musselman Honda Circuit. The deadline for the pre-registration for the Tucson weekend is January 18.

Following the series opener, the Challenge makes its first series visit to the new K1 Circuit in Winchester, California on March 7-9. On April 25-27, the Challenge returns to Sonoma Raceway in Sonoma, California for the third stop in 2025. The series finale and fourth event of the 2025 season pushes the Challenge to the Utah Motorsports Campus in Grantsville, Utah on June 13-15.

The categories offered for the 2025 Challenge of the Americas program remains unchanged with six in total. Shifter Senior is the headline division, welcoming homologated KZ engines along with the ROK Shifter platform. The Shifter Master division compliments the class for drivers 32 years and older or above 190lbs driver weight. The 100cc Senior, 100cc Junior and 100cc Masters return, providing a place for competitors utilizing the IAME KA100 and Vortex VLR engine packages. All five classes will compete with the Shinko CIK Prime (Yellow) tire. 60cc Cadet returns as well, also a multi-engine platform with IAME and Vortex, utilizing the Shinko SHS63 Performance (Green) compound in 2025.

For the first time in series history, Challenge of the Americas is offering competitors the opportunity to reserve their favorite number for the season. In years past, it has been a first come, first serve format when registering and receiving the kart number requested. For $50, each competitor can reserve their favorite number in their category for the season. It is encouraged that competitors submit their number reservation quickly before it is gone. The following are the class number ranges for the 2025 Challenge.

60cc Cadet: 100-199
100cc Junior: 800-899
100cc Senior: 900-999
100cc Masters: 700-799
Shifter Senior: 400-499
Shifter Masters: 500-599

Shinko Kart Tires USA received the first shipment of tires to the United States, with over 200 sets shipped out to dealers over this past week. Nearly 30 different kart shops, race teams and racetracks are among the dealer list for Shinko Kart Tires USA. Visit shinkokartusa.com to find a dealer near you to purchase your first sets of the Shinko brand.