Author(s): Ian Falloon
For nearly 80 years, shaft-drive boxer twins have been the backbone of the BMW motorcycle line-up. For many enthusiasts of the Bavarian marque, the classic BMW twin was the R90S of 1973-1976. Over the decades, successive generations of durable machines - including the R100S, fully-faired R100RS, four-cylinder K series, high-performance R1100RS and an entire family of touring and sporting models ranging from 850 to 1200cc - would ensure the BMW boxer twins a place in the popular Haynes 'Great Bikes' Series.
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Ian Falloon, a highly respected author, has written nine books for Haynes including The BMW Story, as well as Ducati 916 and Ducati Super Sport in the Haynes 'Great Bikes' Series. He lives in Australia.
Historical context, racing, the wartime R75 and the R69S. The '/5' series which enabled BMW to compete with the high-performance Japanese machines. The R90S, the '/6', and Superbike performance. The R100RS, the '/7', and the touring R100RT. Smaller twins, smaller potential. The R89G/S, including a Paris-Dakar version. Rationalisation of the boxer range, and the new twins that included four-valve heads and electronic engine management. Technical specification from 1969 to 2003.