Dyna motorcycles feature big-twin engines and traditional styling. They can be distinguished from the Softail by the traditional coil-over suspension that connects the swingarm to the frame, and from the Sportster by their larger engines. On these models, the transmission also houses the engine’s oil reservoir.In 2006, Harley-Davidson released a line-up of five Dyna models: Super Glide, Super Glide Custom, Street Bob, Low Rider, and Wide Glide.In 2008, the Dyna Fat Bob was introduced to the Dyna line-up featuring aggressive styling, including a new 2-1-2 exhaust, twin headlamps, a 180 mm rear tire and a 130 mm front tire.

The Dyna family uses the 88 cubic inch twin cam from 99-06. From 2007-and on the displacement was increased to 96 cubic inches. This was the result of the factory increasing the stroke to 4 3/8″ inches.