Across 7 covered model years from 1999 to 2011, the Harley-Davidson FLSTF Fat Boy motorcycle has supplied wet/running weights ranging from 672.4 lb (305 kg) to 714.3 lb (324 kg) and dry weights ranging from 665.8 lb (302 kg) to 705.5 lb (320 kg), depending on model year.
Harley-Davidson FLSTF Fat Boy weight overview
This is a very heavy motorcycle. Good footing, sensible parking direction and avoiding awkward slopes make a real difference when handling it at walking speed.
Very Heavy Motorcycle
How heavy is the Harley-Davidson FLSTF Fat Boy?
wet weight
Using a model-level wet weight comparison, the Harley-Davidson FLSTF Fat Boy is heavier than about 75% 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 FLSTF Fat Boy weight & related specs
| Model years covered | 1999, 2000, 2002, 2003, 2006, 2009, 2011 |
|---|---|
| Wet / running weight | 672.4 lb (305 kg) to 714.3 lb (324 kg) |
| Dry weight | 665.8 lb (302 kg) to 705.5 lb (320 kg) |
| Engine displacement | 1,338 cc to 1,584 cc |
| Power | 56 hp |
| Torque | 71.5 lb-ft (97 Nm) to 93.7 lb-ft (127 Nm) |
| Fuel capacity | 4.2 US gal (15.9 L) to 5.2 US gal (19.7 L) |
| Full-tank fuel weight (estimated) | 26.1 lb (11.8 kg) to 32.4 lb (14.7 kg) |
Weight changes by model year
The 1999 model is used as the baseline where data is available. Only later supplied values that differ are shown below. A year pill does not mean every individual weight field was supplied for that year.
Useful weight calculations
| Horsepower per 100 lb | 8.33 hp / 100 lb |
|---|---|
| Pounds per horsepower | 12.01 lb / hp |
| Torque per 100 lb | 10.64 lb-ft / 100 lb to 13.5 lb-ft / 100 lb |
| Displacement per pound | 1.99 cc / lb to 2.3 cc / lb |
| Weight per 100 cc | 43.6 lb / 100 cc to 50.3 lb / 100 cc |
| Fuel weight as % of bike weight | 3.9% to 4.7% |
| Weight with full tank | 697 lb (316.2 kg) to 737.8 lb (334.7 kg) |
What the weight numbers tell you
Harley-Davidson FLSTF Fat Boy weight FAQ
How much does the Harley-Davidson FLSTF Fat Boy weigh?
For the model years covered here, wet/running weight is 672.4 lb (305 kg) to 714.3 lb (324 kg), while dry weight is 665.8 lb (302 kg) to 705.5 lb (320 kg). Do not treat dry and wet figures as interchangeable.
How does the Harley-Davidson FLSTF Fat Boy weight compare with similar Harley-Davidsons?
It is on the heavier side. Its representative wet weight is around the 75th percentile among 168 compatible Harley-Davidson custom/cruiser motorcycles.
Are all Harley-Davidson FLSTF Fat Boy model years the same weight?
There are year-to-year differences in the supplied data. The earliest covered year is used as the baseline, with later changed values shown separately above.
What does a full tank of gas weigh on the Harley-Davidson FLSTF Fat Boy?
A full tank works out to about 26.1 lb (11.8 kg) to 32.4 lb (14.7 kg) from the listed 4.2 US gal (15.9 L) to 5.2 US gal (19.7 L) capacity. Actual fuel density varies slightly, so treat it as a practical estimate.
What does the Harley-Davidson FLSTF Fat Boy weigh with a 180 lb rider?
The approximate combined total is 894.1 lb (405.5 kg) with a 180 lb rider, based on the representative wet/running weight used on this page.
Is the Harley-Davidson FLSTF Fat Boy strong for its weight?
The calculated range is 8.33 hp per 100 lb. This ratio is usually more informative for acceleration comparisons than horsepower alone. That places it around the 19th percentile within the compatible Harley-Davidson custom / cruiser power-to-weight comparison.
What is the estimated Harley-Davidson FLSTF Fat Boy weight with a full tank of gas?
Using the listed dry weight plus the calculated fuel mass, the estimated weight with a full tank is 697 lb (316.2 kg) to 737.8 lb (334.7 kg). That still may not equal official curb weight because dry-weight definitions can exclude other fluids or equipment.
What is the Harley-Davidson FLSTF Fat Boy dry-to-wet weight difference?
Available years with both measurements show about 31.1 lb (14.1 kg) to 48.5 lb (22 kg) added between dry and ready-to-ride figures. Fuel explains part of it, while oil, coolant and specification definitions can explain the rest.
What is the Harley-Davidson FLSTF Fat Boy torque per 100 lb of bike weight?
Available data gives 10.64 lb-ft per 100 lb to 13.5 lb-ft per 100 lb. That ratio helps explain how strong the engine is relative to the bike’s mass, especially at lower speeds.
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.