2011 Harley-Davidson FXDF Dyna Fat Bob, The 2011 Harley-Davidson. Dyna. Fat Bob. FXDF is a Dark Custom with a big motorcycle feel. The Dyna Harley Fat Bob features a Twin Cam 96 engine, providing all the custom Harley power you need. For the custom style you want, the Fat Bob motorcycle's beefy handlebar is truly reminiscent of an aggressive quarter mile monster. And with the wires routed through the steel, you get a clean, minimal look with nothing standing in your way of the open road. Add to that the wide stance and 16-inch front wheel, and you have a cool fat custom look with a powerful big twin engine. And if you like a little Harley chrome on an otherwise stripped down bike, take a look at the Fat Bob rear chrome shocks. These high performance coil over rear chrome shocks give a smooth ride and custom look. For a little more chrome, the Dyna Fat Bob model also features a distinctive cast chrome double headlamp bucket.