For the 2012 model year, the Harley-Davidson FLSTFB Softail Fat Boy Lo motorcycle has a supplied wet/running weight of 731.1 lb (331.6 kg) and a dry weight of 700 lb (317.5 kg).
Harley-Davidson FLSTFB Softail Fat Boy Lo weight overview
The scale number is high enough that parking and low-speed balance deserve real consideration. Once the bike leans too far, recovering it takes much more effort than on a light machine.
Very Heavy Motorcycle
How heavy is the Harley-Davidson FLSTFB Softail Fat Boy Lo?
wet weight
Using a model-level wet weight comparison, the Harley-Davidson FLSTFB Softail Fat Boy Lo is heavier than about 84.2% of 168 Harley-Davidson custom/cruiser motorcycles with compatible weight data.
Dry vs ready-to-ride weight
Bike + rider total weight
These totals use the model’s representative wet weight. They exclude riding gear, luggage and a passenger.
Harley-Davidson FLSTFB Softail Fat Boy Lo weight & related specs
| Model years covered | 2012 |
|---|---|
| Wet / running weight | 731.1 lb (331.6 kg) |
| Dry weight | 700 lb (317.5 kg) |
| Engine displacement | 1,688 cc |
| Torque | 98.7 lb-ft (133.8 Nm) |
| Fuel capacity | 5 US gal (18.93 L) |
| Full-tank fuel weight (estimated) | 31.1 lb (14.1 kg) |
Useful weight calculations
| Torque per 100 lb | 13.5 lb-ft / 100 lb |
|---|---|
| Displacement per pound | 2.31 cc / lb |
| Weight per 100 cc | 43.3 lb / 100 cc |
| Fuel weight as % of bike weight | 4.3% |
| Weight with full tank | 731.1 lb (331.6 kg) |
What the weight numbers tell you
Harley-Davidson FLSTFB Softail Fat Boy Lo weight FAQ
What is the Harley-Davidson FLSTFB Softail Fat Boy Lo dry and wet weight?
Across the covered 2012 years, listed wet/running weight is 731.1 lb (331.6 kg) and listed dry weight is 700 lb (317.5 kg). Check the year-change section because the exact figure can vary by model year.
Is the Harley-Davidson FLSTFB Softail Fat Boy Lo lighter or heavier than other Harley-Davidson custom/cruiser motorcycles?
Compared with similar Harley-Davidsons in this dataset, it is heavier than about 84.2% of 168 custom/cruiser motorcycles using the same weight basis.
How much does a full tank add to the Harley-Davidson FLSTFB Softail Fat Boy Lo?
Based on the supplied 5 US gal (18.93 L) tank capacity, the gasoline itself weighs about 31.1 lb (14.1 kg) when full. This helps explain part of the difference between dry and ready-to-ride mass.
What is the combined Harley-Davidson FLSTFB Softail Fat Boy Lo and rider weight?
Using the model’s representative wet/running weight and a 180 lb rider, the combined bike-and-rider mass is about 911.1 lb (413.2 kg) before riding gear, luggage or a passenger.
How heavy is the Harley-Davidson FLSTFB Softail Fat Boy Lo after filling the fuel tank?
Filling the listed tank brings the calculated bike weight to roughly 731.1 lb (331.6 kg). This estimate is most useful when no official wet/running figure is available.
How much weight do fuel and fluids add to the Harley-Davidson FLSTFB Softail Fat Boy Lo?
Where both figures are available, the listed wet-versus-dry difference is about 31.1 lb (14.1 kg). That gap reflects fuel and operating fluids, plus any differences in how the source defines dry and running weight.
How much of the Harley-Davidson FLSTFB Softail Fat Boy Lo total weight comes from fuel?
The calculated full-tank fuel mass is about 4.3% of the bike’s listed weight. This helps show why a dry-weight number can understate what you actually manage on the road.
How does Harley-Davidson FLSTFB Softail Fat Boy Lo torque compare with its weight?
Where compatible torque and weight figures are available, the model works out to 13.5 lb-ft per 100 lb. This gives more context than torque alone because it relates engine twist to the mass it has to move.
What is the Harley-Davidson FLSTFB Softail Fat Boy Lo engine-size-to-weight ratio?
The available figures work out to 2.31 cc per lb. This is not a performance rating, but it is a useful way to compare engine size against total motorcycle mass.
Motorcycle specifications can vary by model year, market, equipment and the exact dry/curb-weight definition. Calculated fuel-weight and ratio figures on this page are estimates derived from the supplied specifications. Confirm critical figures in the owner’s manual or on the official Harley-Davidson website.