BMW celebrates 90 years of BMW Motorrad with one hell of a bike, the Concept 90. The Concept 90 pays tribute to the classic BMW R 90 S motorcycle, a classic bike that celebrates its 40th birthday this year. The Concept 90 takes the best elements of the R 90 S, Daytona Orange paint and all, and updates it with an air-cooled flat-twin boxer engine, LED lighting, and custom parts by Roland Sands design.