California Prokart Challenge hosts two-round weekend in Fontana California Prokart Challenge hosts two-round weekend in Fontana Handful of drivers double up in win column at CalSpeed Karting Center Bas Kaligis / Monday, July 4, 2022 0 1227 Article rating: No rating The California ProKart Challenge traveled to the CalSpeed Karting Center for the lone double-round weekend of the 2022 season. The June 24-26 event at the Fontana, California facility hosted Rounds Three and Four of the Superkarts! USA regional championship program. Read more