books.google.co.uk - Before the /5 series, BMW had a reputation for producing expensive and idiosyncratic touring motorcycles. But the /5 changed that. Although still expensive, the market was opened to a new world of riders, and during the 1970s the air-cooled boxer evolved into the ground-breaking R90S and R100RS. These...http://books.google.co.uk/books/about/BMW_Boxer_Twins_1970_1995_Bible.html?id=dGYF0kvoyeAC&utm_source=gb-gplus-shareBMW Boxer Twins 1970-1995 Bible
