I just bought a 1971 R75/5 that has matching serial numbers on the frame and engine. The side of the engine casings identify the bike as a R75/5 and so does the Title but... the factory plate on the head tube has the model listed as an R60/5.
I know that BMW made both the R60/5 and R75/5 in 1971 with the only major difference being the engine size. Did BMW share frames for both the 60 and 75 making my bike a R60/5 frame with the 750cc engine or is there more to the story?
Any advice would be appreciated!