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The BMW K75 is a standard motorcycle produced by BMW Motorrad from 1985 to 1995. At the time of its introduction, the K75 was BMW's cheapest motorcycle. It offered a claimed acceleration of 0–60 mph in 4.6 seconds and a top speed of 120 mph (193 km/h).
Various models of the K75 were produced.
The S and RT versions have a rear disc brake and 17 inch rear wheels whereas the others have a single leading shoe drum brake and 18 inch rear wheels. A stiffer "anti-dive" front suspension was added to the S and RT models. The later RT versions had an adjustable windshield that could be raised or lowered. Some taller riders complained of wind buffeting with the smaller S model stock windscreens.
All K75 models share the same drivetrain. They are powered by a 740 cc liquid-cooled inline three-cylinder engine with Bosch fuel injection. The US EPA specific engine produce 68 hp (51 kW) while all others produce 75 hp (56 kW). They utilize a five-speed transmission with a dry clutch and a shaft-driven final drive. The engine is oriented longitudinally to lower the center of gravity and allow the most efficient power transfer to the shaft drive.
The K-series lineup, including the K75 and K100, were not just new models; these designs were radical departures from almost every aspect of previous BMW offerings. The K-bikes introduced new technology and refinement to a premium brand. At the time, BMW and Harley-Davidson were the only major manufactures that did not offer liquid-cooled engines. Competing brands, notably of Japanese manufacture, were touting the superiority of their liquid-cooled engines and had introduced low maintenance shaft-drive technology in a growing number of their models.
The K-series offered refinements such as computer-controlled fuel injection, all stainless steel exhaust, rust-free aluminum fuel tank, anti-lock brakes on later models, mono-lever in the rear and single shock absorber, adjustable headlight, high capacity 460 watt alternator, electrical accessory plug-in, and self-canceling signal lights. The engine design had excellent vibration isolation with an internal counter rotating shaft. Two different forks manufacturers were used: Showa with an outer upper tube diameter of 1.612 in (41 mm) and Fichtel and Sachs measuring 1.627 in (41 mm).
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