| MODEL | HARLEY-DAVIDSON SOFTAIL FAT BOY LO FLSTFB 2015 |
| Year | 2015 |
| Engine Type | Four stroke, V-twin, Twin Cam 103B, counter-balanced, pushrod-operated OHV, hydraulic self-adjusting lifters, 2 valves per cylinder |
| Displacement / Capacity | 1690 cc / 103.1 cu in |
| Bore X Stroke | 98.4 x 111.1 mm / 3.875 x 4.375 in |
| Compression Ratio | 9.6:1 |
| Cooling System | Air cooled |
| Max Power | — |
| Max Torque | 132 Nm / 97.4 lb-ft @ 3000 rpm |
| Ignition | Single-fire, non-wasted, map-controlled spark ignition |
| Induction | Electronic Sequential Port Fuel Injection (ESPFI) |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | Pressurized, dry-sump |
| Gear Box | 6 Speed Cruise Drive |
| Clutch | Multi-plate, wet |
| Final Drive | Belt |
| CHASSIS SPECS | |
| Frame | Mild steel tubular frame, rectangular-section backbone, stamped, cast and forged junctions, forged fender supports, MIG welded |
| Front Suspension | 41.3 mm telescopic fork, lowered 1.15 in |
| Rear Suspension | Hidden, horizontal-mounted coil-over shocks, lowered 1.15 in |
| Front Brakes | Single 300 mm disc, 4-piston fixed caliper, ABS |
| Rear Brakes | Single 292 mm disc, 2-piston caliper, ABS |
| DIMENSION SPECS | |
| Overall Length | 2385 mm / 93.9 in |
| Overall Width | — |
| Overall Height | — |
| Seat Height | 616 mm / 24.3 in (laden), 670 mm / 26.4 in (unladen) |
| Wheelbase | 1630 mm / 64.2 in |
| Ground Clearance | 125 mm / 4.9 in |
| Dry Weight | 317.5 kg / 700 lbs |
| Wet Weight | 330 kg / 731 lbs |
| WHEEL SPECS | |
| Front Tyre | 140/75R17 67V |
| Rear Tyre | 200/55R17 78V |
| FUEL SYSTEM | |
| Fuel Capacity | 18.9 Litres / 5.0 US gal |
| Fuel Consumption | 5.6 L/100 km / 42 US mpg |
| Top Speed | — |
The 2015 Fat Boy Lo got a revised front brake with a new master cylinder and caliper and a larger 300 mm disc, needing less lever effort, plus an easier-to-reach side stand. Otherwise it was the same lowered, black-finished Twin Cam 103 cruiser with standard ABS and new colour options.
