2009Harley-Davidson FLSTF Fat Boy

★ 3.5

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The 2009 Harley-Davidson FLSTF Fat Boy is an iconic cruiser designed for riders seeking classic American styling with modern reliability. Known for its distinctive wide-set front fender and low-slung stance, it delivers smooth, torquey V-twin performance ideal for highway cruising and casual riding. The fuel-injected engine and six-speed transmission offer refined operation for both experienced and newer cruiser enthusiasts.

Capacity: 1584.0 ccm
Engine: V-Twin, four-stroke
Gearbox: 6-speed
Dry weight: 313.0 kg
Seat height: 645 mm
Power: 75.0 HP (55.2 kW)

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What’s new for the 2009 Harley-Davidson FLSTF Fat Boy

vs the 2008

Spec	2008	2009
Power	67.0 HP (49.3 kW)	75.0 HP (55.2 kW)
Torque	115.3 Nm (11.8 kgf-m or 85.0 ft.lbs)	120.0 Nm (12.2 kgf-m or 88.5 ft.lbs)
Dry weight	309.8 kg (683.0 pounds)	313.0 kg (690.0 pounds)
Wet weight	323.9 kg (714.1 pounds)	not listed
Seat height	—	645 mm (25.4 inches)
Front suspension	—	41.3mm telescopic, 'beer can' covers
Rear suspension	—	Hidden, horizontal-mounted, coil-over
Front brakes	Single disc	Single disc. 4-piston
Rear brakes	Single disc	Single disc. 2-piston
Compression	8.9:1	9.2:1

Other years 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011

How it rides

Editorial estimate from the spec sheet - not lab tested

Off-road & trail5%

Cornering30%

City riding45%

Daily riding55%

Touring45%

Two-up55%

Track5%

Best for: Built for stylish boulevard cruising and short-to-medium rides where image and torque-driven presence matter more than outright speed.
Built for: A muscular, classic American cruiser that delivers strong low-end torque and a commanding presence rather than sharp handling or high-rev thrills.
Not ideal for: Not a fit for riders seeking agile cornering, off-road capability, or lightweight everyday maneuverability.

Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.

Will it fit you?

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Your height

Inseam (optional)

Units

At 645mm, a rider of 68.9" with a 31" (estimated) inseam will reach the ground with both feet flat on the 2009 Harley-Davidson FLSTF Fat Boy, with a cramped knee angle of around 70 degrees and an upright riding position.

Assumes about 30mm of suspension sag once seated. This is an approximation from category-typical geometry, not a measurement of this bike or of you - sit on one before you buy.

More bikes at 750 mm or under — Short Kings →

Find bikes that fit your height →

Full specifications

Engine

Capacity: 1584.0 ccm
Power: 75.0 HP (55.2 kW)
Torque: 120.0 Nm (12.2 kgf-m)
Engine type: V-Twin, four-stroke
Power/weight ratio: 0.2396 HP/kg (dry)
Bore x stroke: 95.3 x 111.1 mm
Compression: 9.2:1
Cooling system: Air
Fuel system: Injection
Starting: Electric
Valves per cylinder: 2
Lubrication system: Pressurized, dry-sump

Transmission

Gearbox: 6-speed
Transmission type: Manual
Final drive: Belt
Clutch: 9-plate, wet

Dimensions & weight

Wheelbase: 1635 mm
Overall length: 2396 mm
Seat height: 645 mm
Dry weight: 313.0 kg
Fuel capacity: 18.90 litres
Ground clearance: 130 mm
Oil capacity: 3.30 litres

Chassis & suspension

Frame: Mild steel tubular frame; rectangular section backbone;
Front suspension: 41.3mm telescopic, 'beer can' covers
Rear suspension: Hidden, horizontal-mounted, coil-over
Front wheel travel: 130 mm
Rear wheel travel: 109 mm
Rake (fork angle): 32.0°
Trail: 147 mm

Brakes & wheels

Front brakes: Single disc. 4-piston
Front brakes diameter: 292 mm
Rear brakes: Single disc. 2-piston
Rear brakes diameter: 292 mm
Front tyre: 140/75-R17
Rear tyre: 200/55-R17

Other

Color options: Vivid Black, Black Pearl, Pewter Pearl, Flame Blue Pearl, Black Denim, Red Hot Sunglo

Specs last verified against published sources: September 2026.

Compiled from manufacturer documentation and user contributions, corrected on an ongoing basis. Spotted something wrong? Tell us.

What changed, year to year

Differences highlighted

Specification	1999	2002	2005	2008	2009	2011
Capacity	1338 cc	1449 cc	1449 cc	1584 cc	1584 cc	1584 cc
Dry weight	—	320 kg	320 kg	310 kg	313 kg	315 kg
Seat height	680 mm	—	699 mm	—	645 mm	699 mm
Fuel capacity	15.9 L	18.9 L	19.7 L	18.9 L	18.9 L	18.9 L