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Harley Davidson Dyna Fat Bob

updated 11th of May 2021


Dyna FXDF Fat Bob

The very first things that set the Fat Bob apart from other Dynas are the twin led headlights braced between polished triple clamps as well as the fat wheels. Thanks to the large diameter brake discs, these lasts actually look like Fat Boy units so it’s easy to start confusion especially if the bike cruises along you down the highway.

With drag-style bars and a 5.1 gallons tank that fits different models apart from the Fat Bob (it’s good that they do mention this bike as being the source), this thing already qualifies for a bad boy machine, but not completely. Not yet. Just wait to hear about the right rider side mounted two-into-two exhaust that looks just as good as the one on the V-Rod.





Among the bike’s top features is the one that nobody could possibly miss, the beating and powerfully sounding heart also knows as the Twin Cam 96 engine. The bike’s centerpiece and a work of art itself - the motor - is fuel injected so it will not only provide the unmistakably grunty engine torque of 92 ft. lbs. but ensure low fuel consumption and great responsiveness. There’s also a sixth gear and forward (or mid, it’s optional) mounted foot controls so that you’ll be riding in style down the highway and obtain great mileage while on it too.
Engine4 Air-cooled, Twin Cam 96™
Valves Pushrod-operated, overhead valves with hydraulic,
self-adjusting lifters; two valves per cylinder
Bore x Stroke 3.75 in. (95.25 mm) x 4.38 in. (111.25 mm)
Displacement4 96 cu. in. (1584 cc)
Compression Ratio 9.2:1
Fuel System5 Electronic Sequential Por
t Fuel Injection (ESPFI)
Air Cleaner Fiberglass Media, washable
Lubrication System Pressurized, dry-


  The low seat height of only 26.1 inches might manage to make the Fat Bob look like the ride of everyone, but once you become aware of the massive stature and 703 lbs wet weight (not always an advantage), it will be once again clear that Harleys are destined to serious riders with serious demands from their bikes. Also, riding on big tires with an aggressive tread pattern mounted on 16-inch Slotted Cast Aluminum wheels, the Fat Bob is a cool and confident ride.

1979 Harley-Davidson FXEF Fat Bob


In 1979, Harley-Davidson had introduced the FXEF Fat Bob motorcycle derived from the Super Glide series. This bike is famous to have “donated” its fuel tank to most models of the series and retains the very same original lines of this piece to this day.

After production of the Super Glide was stopped back in 1985, the Fat Bob became base model of the series it once came up to complete and that’s when most of the first generation bikes were sold.

2008 saw the introduction of the all-new FXDF Fat Bob, a machine that was practically reborn just so that the modern Dyna lineup would meets various riding demands. This is also when the aggressive drag style was approached and when the engine together with all goodies of modern technology ended up reflecting the best of it so far.


Engine and Transmission

Engine: Air-cooled, Twin Cam 96
Displacement: 96.00 cu. in.
Bore x Stroke: 3.75 in. x 4.38 in.
Engine Torque: 92.00 ft lbs @ 3000 rpm
Fuel System: Electronic Sequential Port Fuel Injection (ESPFI)
Compression Ratio: 9.2:1
Miles per Gallon: 53 hwy / 34 city
Primary Drive: Chain, 34/46 ratio
Gear Ratio (overall)
1st: 9.312
2nd: 6.421
3rd: 4.774
4th: 3.926
5th: 3.279
6th: 2.790

Chassis and Dimensions

Brakes: 4-piston fixed front, and 2-piston torque-free floating rear
Parking Brake: N/A
Lean Angle (per SAEJ1168): 31° / 30°
Exhaust System: Chrome, 2-1-2 collector exhaust w/ dual mufflers
Front Wheel: Silver, Solid Disc Cast Aluminum
Rear Wheel: Silver, Slotted Disc Cast Aluminum
Wheel Option: N/A
Front Tire: 130/90B16
Rear Tire: 180/70B16
Length: 91.7 in.
Seat Height: 26.1 in. (laden) / 27.0 in. (unladen)
Ground Clearance: 4.92 in.
Rake Steering Head/Trail: 29° / 4.92 in.
Wheelbase: 63.7 in.
Track Width: N/A
Fuel Capacity: 5.0 gal.
Oil Capacity: 3.0 qt.
Dry Weight: 669.7 lbs.
Running Order: 703.0 lbs.


Instruments: Tank-mounted electronic speedometer with odometer, time-of-day clock on odometer, dual tripmeter, 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
Indicator Lamps: High beam, directional light bar, neutral, low oil pressure, engine diagnostics, turn signals, security system6 (optional), 6-speed, low fuel warnings


  • Vibration isolated Twin Cam 96 engine
  • 6-speed Cruise Drive transmission
  • Black powdercoated engine with polished rocker boxes
  • New silver-faced speedometer with range countdown
  • New fuel sender
  • High Performance “Full metal jacket” chrome-covered shock absorbers
  • Chrome Tommy Gun exhaust with Staggered Dual mufflers
  • 180 mm-16 rear / 130 mm-16 front tires
  • Cast Aluminum Slotted Disc 16-inch front/rear wheels
  • Bobtail rear fender
  • 5.1-gallon Fat Bob fuel tank
  • Drag-style handlebar on black riser
  • Polished aluminum triple clamps
  • Black fork lowers and mirrors
  • 28-degree fork angle
  • Dual headlamps
  • Forward or mid foot controls
  • Optional Smart Security System









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