Road King's Timeline! Harley Davidson Road King is one of the iconic motorcycles in the world! Its story started from HD's FL series in 1941 with a 1210cc (74 cu in) Knucklehead engine! Harley Davidson factory has always loved these FL, EL, UL, ULH, FLT, FLH, FLHR, and so on for one reason or the other. I believe that the most hardcore Harley fans understand them but for most of us, they a just Klingon! ;)

 However, before (FL) Road King was called Road King it was Hydra Glide from 1949 to 1958. From -58 to -65 it was Duo-Glide. From -65 to -79 a Tour Glide and then Electra Glide from 1979 to 1994 when it finally came Road King! Confused? Read from here more... HD FL in Wikipedia!