Both racing series are run on road and street courses. While F1 cars race on purpose-built tracks and street circuits, on the other hand, IndyCar Series races are held across ovals, street circuits and road tracks. IndyCars change/alter their suspension depending on what kind of tracks they are racing on. An F1 car suspension design and manufacture is a costly affair. No F1 manufacturer will be able to change an F1 car suspension in time for a race on a different type of surface. F1 cars have higher acceleration, greater downforce and better braking systems because they race on tighter circuits with shorter straights. IndyCar is heavier than an F1 car and relies on its momentum to hold its speed over much longer straights. The ovals have much wider curves than on an F1 track.