The Alphabet Soup of Motorcycles. When you walk into the showroom of a Harley Dealership – it is easy to be blinded by all the chrome, the shiny paint, custom accessories and the wide array of different models to choose from. There are six different frame families and for the model year 2016 there are 38 different new models to choose from. The bike price tags and brochures have an almost cryptic foreign language to them next to the names of the bikes. So here then is a quick guide to help you weed through and understand the difference between an FXDX, FXSTC, FLHT or a XL883. These short- hand acronyms will be imperative when you are ordering parts for your bike, because while a bike maybe in the same family of frame construction – not all parts, will fit on all bikes. Trust me, I have run into this often enough with my own custom builds.