New Touring Motorcycles Harley-Davidson Dyna Street Bob FXDB 2010Dyna models deliver great handling and bold styling. The Harley-Davidson Dyna family has its roots in the factory-custom revolution of the 1970s, and combines Big Twin performance with an extended FX front end. Stripped to the limits of street-legal trim, the Dyna Street Bob is inspired by the classic post-war bobber design