The ROK Sonoma Cup is composed of a subset of ROK classes, collectively referred to as the Northern California ROK Cup. The SKC/NCRC is one of the largest local ROK Cup series in the United States and offers racers the ability to participate in the excellent ROK ladder system as well as national and international competition. The RSC is guided by the Sanzaru Karting Championships Supplemental Rules as well as the National and International ROK Cup rulebooks.

The ROK Cup USA kart racing series is a division of the internationally recognized ROK Cup racing program, powered by the Vortex Engine package. The program promotes parity within the classes, and the parent series, ROK Cup, is an FIA Authorized International Series with a 15-year history in over 32 countries. Powered by the Vortex Engine platform, ROK Cup USA offers a competitive racing package throughout its promoted series, including the Florida Winter Tour, ROK Festivals, and ROK the RIO events, as well as the Challenge of the Americas, a burgeoning regional club program throughout the United States and multiple series in Canada.

All the best ROKKERS from around the world have the opportunity to take part in the prestigious ROK Cup International Final, an international event that crowns global ROK Champions. In 2017, the ROK Cup International Final had a record number of countries represented, 49 from five continents, and saw 415 ROKKERS take to the grid.