Prokart Challenge set for 2025 season finale at K1 Circuit Prokart Challenge set for 2025 season finale at K1 Circuit Superkarts! USA regional program to host sixth and final round of championship Bas Kaligis / Tuesday, October 7, 2025 0 121 Article rating: No rating The 21st season of the Superkarts! USA ProKart Challenge is set to end following the sixth and final round of competition on October 11-12 at the K1 Circuit. For a third time this year, the SKUSA regional program will visit the Winchester, California, facility for the final round of the championship chase. The 1.1-mile ‘Pro Track’ will welcome the competitors on the weekend, fighting for the final points up for grabs. Read more