The Harley-Davidson Super Glide is a motorcycle model made by the Harley-Davidson Motor Company

Harley-Davidson

Harley-Davidson , often abbreviated H-D or Harley, is an American motorcycle manufacturer. Founded in Milwaukee, Wisconsin, during the first decade of the 20th century, it was one of two major American motorcycle manufacturers to survive the Great Depression...

. Reputed to be the first factory custom motorcycle

Custom motorcycle

A custom motorcycle is a motorcycle that is highly stylized or which treats aspects such as frame geometry, engine design, or paintwork in an unusual way compared to standard manufacturing. Custom motorcycles are unique or individually produced in a very limited quantity, as opposed to "stock"...

, 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

Harley-Davidson FL

FL is a model designation used on motorcycles manufactured by Harley-Davidson from 1941 to present. Mostly applied to Harley's large-framed bikes, including the current Touring series, the FL designation is also used with their Softail series, especially on Softails with traditional styling,...

 motorcycles. The current Super Glide model is now based on the Dyna Glide chassis which offers a wider variety of front ends and trim levels, and continues to fill the intermediate niche between the smallest and largest Harley models.
From 1934 to 1970, with the exception of the Servi-Car

Harley-Davidson Servi-Car

The Harley-Davidson Servi-Car was a three-wheeled utility motorcycle manufactured by Harley-Davidson from 1932 to 1973.-Concept and uses:The Servi-Car was designed during the Great Depression when Harley-Davidson was desperate to expand its product base to increase sales...

, there have been two distinct lines of V-Twin

V-twin

A V-twin engine is a two-cylinder internal combustion engine where the cylinders are arranged in a V configuration.- Crankshaft configuration :Most V-twin engines have a single crankpin, which is shared by both connecting rods...

 Harley-Davidson motorcycles, the small twins and the big twins.