1921 Indianapolis 500 1921 Indianapolis 500 The 9th International 500-Mile Sweepstakes Race was held at the Indianapolis Motor Speedway on Monday, May 30, 1921. Ralph DePalma dominated yet another early running of the 500, but again fails to win. He led 109 laps, and had a two-lap lead at the halfway point. A connecting rod broke, and he dropped out on lap 112. DePalma retires with one win, and 612 laps led in the "500." His laps led record would not be matched for 67 years until Al Unser, Sr. tied it in 1987. Tommy Milton won the first of two 500 victories.
1927 Indianapolis 500 1927 Indianapolis 500 The 15th International 500-Mile Sweepstakes Race was held at the Indianapolis Motor Speedway on Monday, May 30, 1927. First-time starter George Souders wins by eight laps, the largest margin since 1913. Souders becomes the first driver to win the full-500 mile race solo, with neither help from a relief driver, nor accompanied by a riding mechanic. Four-lap (10 mile) qualifying runs were utilized. Frank Lockhart won the pole position with a speed of 120.10 mph. Lockhart set a new 1-lap track record on his final lap. For 1927, riding mechanics were optional; however, no teams utilized them.