Harley-Davidson FLSTFB Softail Fat Boy Lo - 2012 Specifications and Reviews
The 2012 Harley-Davidson FLSTFB Softail Fat Boy Lo is a cruiser that appeals to riders seeking classic styling with a low-slung profile and commanding presence. Known for its iconic fat tires, retro design, and accessible seat height of 24.3 inches, this bike delivers authentic Harley character for both experienced cruiser enthusiasts and those transitioning to larger machines. The Fat Boy Lo combines aggressive aesthetics with practical features like electronic instrumentation and a comfortable two-up seat configuration.
General information | |
| Category | Custom / cruiser |
| Year | 2012 |
| Model | Harley-Davidson FLSTFB Softail Fat Boy Lo |
| | |
Engine and Transmission Specifications | |
| Exhaust system | Denim Black and Satin Chrome, over/under shotgun exhaust with dual mufflers |
| Greenhouse gases | 129.9 CO |
| Fuel consumption | 5.60 litres/100 km (17.9 km/l or 42.00 mpg) |
| Driveline | Primary Drive Chain, 34/46 ratio. Final Drive Belt, 32/66 ratio. |
| Clutch | Multi-plate with diaphragm spring in oil bath |
| Transmission type,final drive | Belt |
| Gearbox | 6-speed |
| Cooling system | Air |
| Lubrication system | Pressurized, dry-sump |
| Fuel control | DOHC |
| Fuel system | Injection. Electronic Sequential Port Fuel Injection (ESPFI) |
| Bore x stroke | 98.4 x 111.3 mm (3.9 x 4.4 inches) |
| Compression | 9.6:1 |
| Torque | 133.84 Nm (13.6 kgf-m or 98.7 ft.lbs) @ 3000 |
| Engine details | Air-cooled, Twin Cam 103B |
| Engine type | V2, four-stroke |
| Capacity: | 1687.97 ccm (103.00 cubic inches) |
Brakes, suspension, Frame and wheels | |
| Wheels | Black, Bullet Hole Disc Cast Aluminum |
| Rear brakes diameter | 292 mm (11.5 inches) |
| Rear brakes | Single disc. 2-piston caliper. Optional ABS. |
| Front brakes diameter | 292 mm (11.5 inches) |
| Front brakes | Single disc. 4-piston caliper. Optional ABS. |
| Rear tyre dimensions | 200/55-R17 |
| Front tyre dimensions | 140/75-R17 |
| Rear suspension travel | 91 mm (3.6 inches) |
| Rear suspension | Hidden, horizontal-mounted, coil-over |
| Front suspension travel | 130 mm (5.1 inches) |
| Front suspension | 41.3 mm telescopic, beer can covers |
| Trail | 147 mm (5.8 inches) |
| Rake (fork angle) | 31.6° |
| Frame type | Mild steel tubular frame; rectangular section backbone; stamped, cast, and forged junctions; forged fender supports; MIG welded |
Physical measures and capacities | |
| Oil capacity | 3.30 litres (0.22 quarts) |
| Fuel capacity | 18.93 litres (5.00 gallons) |
| Wheelbase | 1,638 mm (64.5 inches) |
| Ground clearance | 122 mm (4.8 inches) |
| Overall length | 2,395 mm (94.3 inches) |
| Seat height | 616 mm (24.3 inches) If adjustable, lowest setting. |
| Weight incl. oil, gas, etc | 331.6 kg (731.0 pounds) |
| Dry weight | 317.5 kg (700.0 pounds) |
Other specs | |
| Maintenance | Find parts, fluids, filters, maintenance tools and service items on eBay |
| Color options | Vivid Black, Big Blue Pearl, Brilliant Silver Pearl, Black Denim |
| Factory warranty | 2 years, unlimited mileage. |
| Seat | Two-piece, two-up Softail seat with removable pillion |
| Electrical | Sealed, maintenance-free, 12V, 19-amp/hour, 270 cca |
| Light | 55-watt low beam, 60-watt high beam |
| Instruments | Tank-mounted electronic speedometer with odometer, time-of-day clock on odometer, dual tripmeter, RPM/gear display, fuel gauge with low fuel warning light and countdown feature, low oil pressure indicator light, engine diagnostics readout, LED indicator lights, 6-speed indicator light |
| Starter | Electric |
Performance Profile & Rider Fit
Best For
Rider Profile
| Best For | Best suited to riders with some prior experience handling heavy, low-slung cruisers, since its mass and limited ground clearance demand deliberate, unhurried inputs. |
| Purpose | Built for laid-back boulevard cruising and image-driven style riding rather than outright speed or cornering agility. |
| Rider Fit | A tall or long-legged rider will appreciate the low 616mm seat height and easy reach to the ground, but the substantial dry weight over 300kg means low-speed maneuvering and parking lot U-turns require confidence and strength. |
| Character | This bike suits a rider who values classic Fat Boy styling, deep torque off idle, and a commanding, planted highway presence over agility or aggressive performance. |
| Not Ideal For | Not a good fit for riders wanting sharp cornering ability, off-road capability, or a lightweight, flickable machine for tight urban lane-splitting. |
Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.
⚠ Safety Recalls (1)
Harley-Davidson Motor Company (Harley-Davidson) is recalling certain model year 2012 FXST103, FLSTC, FLSTC103, FLSTF, FLSTF103, FXDL, FXDWG, FXDWG103, FXDC, FXDB, FLSTN, FLSTN103, FLSTC103Shrine, FLSTFB, FLSTFB103, FXS, FXS103, FLS, FLS103, FLD, FLD103, FXDF, and FXDF103 Dyna and Softail motorcycles manufactured August 22, 2011, through February 24, 2012. In the affected motorcycles, the threads for the brake line banjo bolt in the front brake master cylinder may corrode.
Risk: If the threads corrode, a sudden loss of brake fluid could result, causing a loss of the front brakes, and increasing the risk of a crash.
Remedy: Harley-Davidson will notify owners, and dealers will flush and inspect the front brake master cylinder and, if necessary, replace the master cylinder, free of charge. The recall is expected to begin on January 22, 2015. Owners may contact Harley-Davidson customer service at 1-800-258-2464. Harley-Davidson's number for this recall is 0163 and 0164.
Source: NHTSA. View all Harley-Davidson recalls →
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