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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.
- K75—a naked bike with no fairing
- K75T—a US-only touring model with a windscreen, touring bags, engine crash bars, and a rear top case
- K75C—with a small handlebar mounted 'cockpit' fairing
- K75S—with sports fixed fairing and lower bars
- K75RT—with full fairing for 'road touring'
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.
Engine and transmission
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.
Background to K75 launch and design
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 like computer-controlled fuel injection, all stainless steel exhaust, rust-free aluminum fuel tank, anti-lock brakes or ABS 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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