Softail® Fat Boy. WE FATTENED IT UP QUITE A BIT LAST YEAR, ND IT CONTINUES TO ROLL AS THE HEAVYWEIGHT CHAMP OF FUNKY CUSTOM. Its front fender shows off the broad 17-inch front wheel. Its custom skirted back fender sits above a 200-millimeter rear tire. The wheels are solid slabs of cast aluminum, inged with 0.50-caliber, ullet-sized holes. Everything about this motorcycle commands space on the road. The seat is low and wide. The thick 96-cubic-inch helping of Harley-Davidson V-Twin engine is served up in chrome and black. Thereâs a shotgun exhaust. The Fat Boy® is what itâs always been and more. One big-boned knockout.