IndyCars can reach top speeds of over 230 mph (370 km/h), particularly on oval tracks like the Indianapolis Motor Speedway. These high speeds are due to the cars’ aerodynamic design and powerful engines, which produce around 700 horsepower. IndyCars tend to reach lower speeds on road and street circuits due to tighter corners and braking zones, typically maxing out around 180-200 mph (290-320 km/h). However, on ovals, the wide, banked turns allow drivers to sustain higher speeds over long distances.