2018 Harley-Davidson Fat Boy, Used 2018 Harley-Davidson Fat Boy FLFB For Sale at Hale's Harley-Davidson in Mansfield, Ohio.The look of the Fat Boy is more muscular than ever, thanks to all-new solid-disc wheels, a 240mm rear tire and the 160mm front tire. Add the jaw-dropping satin chrome finishes and signature LED forward lighting, and you ve got a look that will make an even bigger impact than the first Fat Boy motorcycle made when it rolled off the line. But now, the Fat Boy is 29 pounds lighter. You ll feel the difference that makes the first time you tip it up off its side stand. Combine that with the increased power of the Milwaukee-Eight V-Twin engine, and then imagine what that means when the light turns green. Hitting the throttle on the Fat Boy will thrill you. Because underneath, it s all muscle.