Xtream Rock Island Grand Prix powered by Mediacom announces course changes for 25th anniversary races Xtream Rock Island Grand Prix powered by Mediacom announces course changes for 25th anniversary races Bas Kaligis / Friday, August 9, 2019 0 6038 Article rating: 5.0 The Xtream Rock Island Grand Prix powered by Mediacom has announced its race staff for 2019, the event’s 25th anniversary. Rock Island is the only time each year that this all-star team of officials work together. Read more