Chevrolet Detroit Grand Prix Race 1 IndyCar Series 2021 7 2021-06-12 2021-06-12 The 2.35-mile, 13-turn temporary street circuit on Detroit's Belle Isle presents numerous challenges to drivers -- from hard braking zones to speedy straights. The same areas are ripe for overtaking. Belle Isle has held doubleheader NTT INDYCAR SERIES race weekends dating back to 2013. 1149123