2010 Harley-Davidson FXDF - Dyna Fat Bob, CLean bike. Fully serviced and ready to ride. 2010 Harley-Davidson® Dyna® Fat Bob® The Harley-Davidson® Dyna® Fat Bob® is a limited-production custom motorcycle that projects an agressive, super-duty presence behind a beefy front wheel, twisted Tommy Gun exhaust, bold paint and innovative custom styling.