<P> The Harley - Davidson Super Glide was a motorcycle model made by the Harley - Davidson Motor Company . Reputed to be the first factory custom motorcycle, it originated Harley's FX series of motorcycles by mating Sportster components, most notably the front end, with the chassis of their larger big twin motorcycles . Super Glide models from 1991 to 2017 were based on the Dyna Glide chassis which offers a wider variety of front ends and trim levels, and for a time filled the intermediate niche between the smallest and largest Harley models; the Dyna platform has since been discontinued for the 2018 model year in favor of the new Softail frame, with some models from the Dyna nameplate being carried over to the Softail line . </P> <P> From 1934 to 1970, with the exception of the Servi - Car, there have been two distinct lines of V - Twin Harley - Davidson motorcycles, the small twins and the big twins . However, individual bikers would sometimes customize bikes by changing parts around or cutting and rewelding frames and other components to suit their tastes . </P>

What does dyna stand for in harley davidson