to design a four-stroke road model. At the end of 1952, the MV Agusta 175 was released in two versions: CST and CSTL. It was their first production machine with a four-stroke engine. The unit construction single-cylinder engine was designed with an overhead camshaft for high performance. The chain-driven camshaft operated the valves via rocker arms, which were closed by hairpin valve springs. The engine was inclined forward at 10° and manufactured in alloy and a bore and stroke of 59.5 × 62 mm. This model had a frame of a double loop design using tubes for the front sections and pressed steel members at the real. The engine was used as a stressed member. Suspension was telescopic forks at the front and a swinging arm at the rear. The 175 CST was equipped with separate saddles and 17" wheels, the CSTL (Turismo Lusso) had 19" wheels and a "long seat" (dualseat) fitted. The 175 CST weighed 103 kg and figured top speed of 100 km/h. In less than a year MV Agusta introduced a sportier version 175 CS with a larger carburetor (22 mm instead of 18 mm), a higher compression ratio, a larger cylinder head with bigger fins, aluminum wheel rims and plenty of glossy red paint. Its 175 cc one-cylinder engine produced 11 hp at 6700 rpm, giving a 115 km/h top speed. This model featured lower handlebars, a more sporty riding position and a beautifully sculpted fuel tank that quickly earned it the unofficial nickname "Disco Volante" (English: flying saucer) as, viewed from the front, the tank shape was reminiscent of a flying saucer. In July 1954, MV began offering a very limited-availability racing model 175 CSS (Super Sport). The engine was further turned from the CS model, including higher compression ratio and a larger carburetor, to produce 15 hp at 8,800 rpm. Cycle parts were the same as the CS model, except it was fitted with Earles forks. In 1955, MV Agusta designed the 175 CSS-5V for the 175 cc Formula Sport Derivata race series. The "Squalo" (English: shark), as it was generally known, had a lighter frame based on that used on the works racers, larger brakes, a magneto, Earles forks and a five-speed gearbox. The bike became the part of motorcycle racing history thanks to the first victory of young Mike Hailwood, the future nine-time world champion. Mike won his first ever race