2008 Harley-Davidson FXDF - Dyna Fat Bob, Join the Motor City Family Today! 2008 Harley-Davidson® Dyna® Fat Bob A massive new presence in the Dyna® family, FXDF Dyna® Fat Bob takes factory-custom styling in a bold, new direction. The dual headlamps mounted between polished triple-clamps are a signature Fat Bob element. Chunky new tires front and rear are mounted on 16-inch Slotted Cast Aluminum wheels.