Question: The Brabham BT54 Formula One racing car used tires with a network of around how many distributors and retailers?
Context: The Jaguar R5 was a Formula One racing car used by Jaguar Racing to contest the 2004 Formula One season.  The R5 was the last chassis made by Jaguar Racing, before they became Red Bull Racing in .  The car was driven by Mark Webber and rookie Christian Klien and its first 2004 Formula One race was at the Circuit de Catalunya, Barcelona. Motor Racing Developments Ltd., commonly known as Brabham , was a British racing car manufacturer and Formula One racing team.  Founded in 1960 by two Australians, driver Jack Brabham and designer Ron Tauranac, the team won four Drivers' and two Constructors' World Championships in its 30-year Formula One history.  Jack Brabham's 1966 Drivers' Championship remains the only such achievement using a car bearing the driver's own name. The Brabham BT50 was a Formula One racing car designed by Gordon Murray and powered by a turbo BMW engine.  It was raced by the Brabham team, owned by Bernie Ecclestone, during the 1982 Formula One season.  Driven by Nelson Piquet and Riccardo Patrese, it made its debut at the South African Grand Prix before being withdrawn for further development of its engine while the team reverted to the previous year's car, the Brabham BT49.  On the reintroduction of the BT50, Piquet finished fifth in the Belgian Grand Prix.  A few races later he drove it to a win in the Canadian Grand Prix.  Later in the year it achieved three more finishes in the points for the team.  During the second half of the season, Brabham implemented the strategy of mid-race refueling.  This allowed Piquet and Patrese to start the races relatively light and use their reduced weight to gain track position over their competitors before stopping to refuel.  The poor reliability of the BT50 meant that they had only a few opportunities to demonstrate the strategy in practice. The Brabham BT54 was a Formula One racing car designed by Gordon Murray for the Brabham team for the Formula One season.  The car was powered by the BMW M12 4cyl turbo engine (generally agreed to be the most powerful engine in Formula One at the time) and used Pirelli tyres.  Like most of its rivals, Brabham had used Michelin tyres in .  However, when the French company pulled out of Grand Prix racing at the end of that season, team owner Bernie Ecclestone took a gamble and instead of signing with Goodyear for their proven rubber, signed with the Italian company instead. Pirelli & C. S.p.A. is a multinational company based in Milan, Italy, formerly listed on the Milan Stock Exchange since 1922, but now an overseas subsidiary of Chinese state-owned enterprise ChemChina.  The company is one of the largest tyre manufacturers behind Bridgestone, Michelin, Continental and Goodyear.  It is present in over 160 countries, has 19 manufacturing sites in 13 countries and a network of around 12,500 distributors and retailers. The ATS D7 was a Formula One racing car used by Team ATS in the 1984 Formula One season.  The car was designed by Gustav Brunner and was driven for most of the season by German Manfred Winkelhock.  He was joined in a second car late in the season by Formula One rookie, Austrian driver Gerhard Berger.  It was the last ever car produced by the ATS team. The Brabham BT60 was the final series of Formula One racing cars built for the Brabham Formula One motor racing team.  Designed by Sergio Rinland, they raced in the 1991 and 1992 Formula One World Championships.  The car brought to a close Brabham's 30 years of construction of purpose-built racing cars, which began with Jack Brabham and Ron Tauranac and the Brabham BT1 Formula Junior design in 1961. The Brabham BT3 is a Formula One racing car.  It was the first Formula One design to be produced by Motor Racing Developments for the Brabham Racing Organisation, and debuted at the 1962 German Grand Prix.  The Brabham BT3 was the vehicle with which team owner – then two-time World Champion – Jack Brabham, became the first driver ever to score World Championship points in a car bearing his own name, at the 1962 United States Grand Prix.  The following year Brabham also became the first driver ever to win a Formula One race at the wheel of an eponymous car, again driving the BT3, at the 1963 Solitude Grand Prix.  The BT3 design was modified only slightly to form the Tasman Series-specification Brabham BT4 cars. The Brabham BT19 is a Formula One racing car designed by Ron Tauranac for the British Brabham team.  The BT19 competed in the and Formula One World Championships and was used by Australian driver Jack Brabham to win his third World Championship in 1966.  The BT19, which Brabham referred to as his "Old Nail", was the first car bearing its driver's name to win a World Championship race. The Brabham BT55 was a Formula One racing car designed by Gordon Murray and David North for the Brabham team owned by Bernie Ecclestone.  It used a BMW four-cylinder turbocharged engine tilted over on its side to allow a clear supply of air to the rear wing.  The car competed during the 1986 Formula One season.  It was not successful and its introduction coincided with the end of Brabham's time as a competitive team.  Murray's next car (which he helped Steve Nichols design), McLaren's MP4/4, is usually claimed to be based on the same principles and won 15 of 16 races in 1988.
Answer: 12,500