Harley-Davidson is one of the world's largest motorcycle manufacturers.Dyna-frame motorcycles were developed in the 1980s. Prior to 2006, Dyna models featured a narrow, XL-style 39mm front fork and front wheel, as well as footpegs which the manufacturer included the letter "X" in the model designation to indicate. This lineup included the FXD,FXDC, Street Bob (FXDB) and FXDL.