What makes Harley-Davidson an exceptional option for many motorcyclists is the endless array of parts and accessories available.
Harley-Davidson has released over 30 unique motorcycles for 2011 alone. Harley has developed a system whereby each motorcycle is sub-classed into further sections based on a variety of differences between bikes. Although these differences can be subtle when considering bikes from the same family, nevertheless, it is important to ensure you have the appropriate abbreviation for your bike when ordering parts and accessories.

Current Model Designations
Harley enthusiasts will recognize their particular models by their given family names: Sportster (XL), Dyna (D), Softail (ST), V-TWIN Racing Street Custom (VRSC) and Touring model (HT or LT). Add to this Harley-Davidson’s line up of Trikes and Custom Vehicle Operation (CVO) specials and owners are spoilt for choice. However, these abbreviations are only part of the key to understanding your particular bike model. For instance, for 2011 there are six Sportster variations alone: The Nightster (XL1200N), the Superlow, the Iron 883, the XR1200X, the 1200 Low and the wildly popular Forty-Eight.Model Features
According to Factory-Fat.com, each Harley-Davidson motorcycle is further designated with special abbreviations that denote engine series, front end (except Sportsters), frame style and the model within the frame family. For example, the abbreviation ‘FXDFB’ stands for Harley-Davidson’s big twin-engine (F) with Sportster telescopic forks (X) and a Dyna frame (D). The model of the bike is a Fat Bob (FB).Other abbreviations are not as straight forward. For example, the abbreviation ‘FXRT/P’ stands for Harley-Davidson’s big twin-engine (F) with Sportster telescopic forks (X) and a Road King frame (R). This bike has a frame mounted fairing (T) and is a Police special (P). However, the letter ‘R’ could also stand for 'race' or 'rubber mounted.' Hence, be certain that you understand correctly what each letter stands for in your bike’s series abbreviation.