BMW Motorcycle Wallpapers

BMW motorcycles Motorcycle; photo wallpapers: BMW motorcycles were first produced in 1923 and had an unusual "boxer twin" engine, with two air-cooled cylinders protruding from opposite sides of the machine. The R series currently designates machines with a boxer-twin engine, the K series has an inline 4-cylinder engine, and the F series has a single cylinder Rotax engine. During WWII BMW produced the BMW R75 motorcycle with a sidecar attached. Unusually, the sidecar's wheel was also driven. Combined with a lockable differential, this made the vehicle very capable off-road, an equivalent in many ways to the Jeep. BMW motorcycles tend to be relatively large and heavy, and relaxed and comfortable to ride. All BMW motorcycles except for the F series (which have a chain or belt drive) use shaft drive, a characteristic of BMW motorcycles since 1923. BMW updated the traditional R design in 1993. These new bikes were principally oil-cooled (hence, called oilheads) and had 4 valves per cylinder. (Older Rs are principally air-cooled, and called airheads.) In 2004, BMW updated the oilhead boxer engine, adding double spark plugs per cylinder, a built-in balance shaft, an increased capacity to 1200 cc and enhanced performance to 100 hp (75 kW) for the R1200GS, compared to 85 hp (63 kW) of the previous oilhead s R1150GS. In 2004, BMW introduced the new K1200S Sports Bike which marked a departure for BMW. It is both powerful (the engine is a 167bhp unit derived from the company's work with the Williams F1 team) and significantly lighter than previous K models. It was BMW's latest attempt to keep up with the pace of development of sports machines from the likes of Honda, Kawasaki and Suzuki. Innovations include a unique electronically adjustable front and rear suspension, and a Hossack-type front fork BMW calls Duolever. BMW was one of the earliest manufacturers to offer ABS on production motorcycles. BMW is an innovator in motorcycle suspension design. Most modern examples use single-sided rear swingarms. Their trademark front suspension design, called the Telelever, was first seen in the early 1990s. The Telelever significantly reduces dive under braking, and is sometimes criticized by sport riders as insulating the rider from road inputs, therefore reducing the rider's "feel" for the roadway. [br] [br]

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