The Porsche Supercup (officially known as Porsche Mobil 1 Supercup, known as Porsche Michelin Supercup prior to 2007) is an international one-make sports car racing series supporting the FIA Formula One World Championship organized by Porsche Motorsport GmbH. Porsche Supercup drivers compete in identical Porsche 911 GT3 Cup cars. On average, 24 race cars take part in each race. Most circuits visited by the series are European, although circuits in Bahrain, United Arab Emirates, the United States and Mexico have been included in the calendar as well. History Since 1993 the Porsche Michelin Supercup has run as support to the FIA Formula One World Championship. The number of races has grown from the original nine to total 13 in 2006, although decreasing to 11 in 2017 and eight in 2020. Regulations Two sets of slick tyres may be used per car each weekend. The number of wet tyres is unlimited. The tyres are identical for all competitors and are not permitted to be pre-warmed or chemically treated. The in-race pit stop is also allowed if in case of force majeure like tyre puncture, body damage, weather conditions changing and others but in-race pit stop is not mandatory due to shorter race duration and also refuelling is not permitted during race only. Racing flags These are the racing flags that usually used in every Porsche Mobil 1 Supercup race weekends: Racing cars Chassis Porsche Supercup cars adhere to a rear-engined rear-wheel-drive design. A roll cage serves as a carbon-fibre space frame chassis and is covered by a multiple-gauge sheet metal body. They have a closed cockpit, fenders, a rear wing, and an aerodynamic splitter. Each team may purchase cars and engines from other teams. The car has a front MacPherson strut suspension, and a rear Multi-link suspension. Brake discs must be made of steel and may not exceed diameter. The only aerodynamic components on the vehicles are the front splitter, rear wing, solid polycarbonate glass window in the windows only, and side skirts. The use of rear diffusers, vortex generators, canards, wheel well vents, hood vents, and undertrays are prohibited. Porsche Supercup cars are required to have at least 1 working windshield wiper installed on the car for all tracks as a part of the road racing rules package. Evolution of Porsche Supercup cars 911 Cup (Type 964) For the inaugural 1993 Porsche Supercup season the 964 Cup (used in Carrera