Across 4 covered model years from 2007 to 2012, the Harley-Davidson FLSTF Softail Fat Boy motorcycle has supplied wet/running weights ranging from 714.1 lb (323.9 kg) to 725.1 lb (328.9 kg) and dry weights ranging from 690 lb (313 kg) to 694 lb (314.8 kg), depending on model year.
Harley-Davidson FLSTF Softail Fat Boy 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 FLSTF Softail Fat Boy?
wet weight
Using a model-level wet weight comparison, the Harley-Davidson FLSTF Softail 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 Softail Fat Boy weight & related specs
| Model years covered | 2007, 2008, 2010, 2012 |
|---|---|
| Wet / running weight | 714.1 lb (323.9 kg) to 725.1 lb (328.9 kg) |
| Dry weight | 690 lb (313 kg) to 694 lb (314.8 kg) |
| Engine displacement | 1,573.3 cc to 1,688 cc |
| Torque | 88.5 lb-ft (120 Nm) to 98.7 lb-ft (133.8 Nm) |
| Fuel capacity | 5 US gal (18.92 L) to 5.2 US gal (19.7 L) |
| Full-tank fuel weight (estimated) | 31.1 lb (14.1 kg) to 32.4 lb (14.7 kg) |
Weight changes by model year
The 2007 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
| Torque per 100 lb | 12.39 lb-ft / 100 lb to 13.61 lb-ft / 100 lb |
|---|---|
| Displacement per pound | 2.2 cc / lb to 2.33 cc / lb |
| Weight per 100 cc | 43 lb / 100 cc to 45.4 lb / 100 cc |
| Fuel weight as % of bike weight | 4.3% to 4.7% |
| Weight with full tank | 722.4 lb (327.7 kg) to 725.1 lb (328.9 kg) |
What the weight numbers tell you
Harley-Davidson FLSTF Softail Fat Boy weight FAQ
What is the Harley-Davidson FLSTF Softail Fat Boy dry and wet weight?
Across the covered 2007, 2008, 2010, 2012 years, listed wet/running weight is 714.1 lb (323.9 kg) to 725.1 lb (328.9 kg) and listed dry weight is 690 lb (313 kg) to 694 lb (314.8 kg). Check the year-change section because the exact figure can vary by model year.
Is the Harley-Davidson FLSTF Softail Fat Boy lighter or heavier than other Harley-Davidson custom/cruiser motorcycles?
Compared with similar Harley-Davidsons in this dataset, it is heavier than about 75% of 168 custom/cruiser motorcycles using the same weight basis.
Which Harley-Davidson FLSTF Softail Fat Boy years have different weight specs?
The supplied data shows different weight figures across the 2007, 2008, 2010, 2012 model years. Use the year-specific changes section above for the exact value attached to each changed year.
How much does a full tank add to the Harley-Davidson FLSTF Softail Fat Boy?
Based on the supplied 5 US gal (18.92 L) to 5.2 US gal (19.7 L) tank capacity, the gasoline itself weighs about 31.1 lb (14.1 kg) to 32.4 lb (14.7 kg) when full. This helps explain part of the difference between dry and ready-to-ride mass.
What is the combined Harley-Davidson FLSTF Softail Fat Boy and rider weight?
Using the model’s representative wet/running weight and a 180 lb rider, the combined bike-and-rider mass is about 894.1 lb (405.5 kg) before riding gear, luggage or a passenger.
How heavy is the Harley-Davidson FLSTF Softail Fat Boy after filling the fuel tank?
Based on the available dry-weight and tank-capacity data, a full-tank estimate is 722.4 lb (327.7 kg) to 725.1 lb (328.9 kg). Oil, coolant and market-specific equipment can still make actual ready-to-ride weight different.
How much torque does the Harley-Davidson FLSTF Softail Fat Boy have per 100 lb?
Where compatible torque and weight figures are available, the model works out to 12.39 lb-ft per 100 lb to 13.61 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 FLSTF Softail Fat Boy displacement per pound?
The available figures work out to 2.2 cc per lb to 2.33 cc per lb. This is not a performance rating, but it is a useful way to compare engine size against total motorcycle mass.
What is the Harley-Davidson FLSTF Softail Fat Boy weight difference versus the category median?
Compared with the median Harley-Davidson custom/cruiser motorcycle weight of 672 lb (304.8 kg), the model is roughly 42.1 lb (19.1 kg) heavier.
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.