Tire rule changes at Xtream Rock Island Grand Prix Tire rule changes at Xtream Rock Island Grand Prix Bas Kaligis / Monday, March 18, 2024 0 521 Article rating: No rating The Xtream Rock Island Grand Prix, the world’s largest and most prestigious karting street race, will run for the 29th time this August 31-September 1. In response to a number of racers, an adjustment has been made to the race’s spec tire rules. Read more