13. BMW R69S
The R69S, R69US, and R69 are motorcycles manufactured by BMW in Munich, Germany and were fitted with 594 cc boxer twin engines. From 1955 to 1969, 15,347 of these 594 cc shaft-drive, opposed twin motorcycles were built. They were designed as relatively high powered, high compression sports bikes. The R69US versions, with telescopic forks, were used later on the BMW R5 series motorcycles. They were introduced in the US market for the 1968 model year and then continued on until 1969.