Supermodifieds are generally constructed from aircraft-quality .095 thick chromium-molybdenum ("chromoly") frame tubing with steel and aluminum components. The bodies are fabricated from fiberglass and aluminum. The cars are powered by fuel-injected V8 engines that run on methanol fuel and can produce in excess of 800 horsepowerModern era supermodifieds run a radical offset chassis that is up to 18 in. to the left of center. The giant wings, (generally 24 sq ft (2.2 m2)' max), mounted on the roll cage of the cars bear a resemblance to those found on sprint cars and serve a similar purpose, designed to produce down force and allow them to make tight turns at high speed. The west coast style cars of ERA and SMRA run a fixed wing, whereas the cars of the east generally run a wing mounted to the suspension or chassis by pneumatic struts. The racing slick tires used on a supermodified are among the widest used in pavement oval racing.Like sprint cars, supermodifieds do not have starters, batteries, or transmissions and are push-started.The combination of high power, light weight, and high cornering ability allow supermodifieds to average over 120 miles per hour (190 km/h) on a 1/2-mile oval and 150 mph (240 km/h) on a 1-mile (1.6 km) oval, with top speeds over 190 mph (310 km/h). They are thought by many to be the fastest short oval track race cars in use. Click for Videos