Harley-davidson Dyna Fat Bob
The Harley-davidson Dyna Fat Bob has a top speed of 185 km/h, produces 68 hp and weighs 305 kg. Motoryk rates it 7.8/10.
The Harley-Davidson Dyna Fat Bob (FXDF) was introduced in 2008 as part of the Dyna family, featuring a distinctive dual headlight setup and a fat front fender that gave it a raw, aggressive bobber-inspired aesthetic. It quickly became popular among riders seeking a more muscular, stripped-down look compared to other Dyna models, and received the Twin-Cooled Milwaukee-Eight engine upgrade when Harley transitioned the Softail line absorbed the Dyna range in 2018. The Fat Bob name was then carried forward into the Softail lineup for 2018 onwards with a completely redesigned chassis and updated styling.
68 hp
Power
112 Nm
Torque
305 kg
Weight
185 km/h
Top Speed
5.5 L/100km (approx. 18 km/L, real-world average for 2008-2017 Dyna Fat Bob)
Fuel
Naked
Body
Video Review
What Buyers Should Know
Watch the Twin Cam
The Twin Cam 96/103 engines in 2008-2017 Fat Bobs are known for cam chain tensioner wear — a common and costly issue if ignored. Always verify this has been inspected or upgraded before buying used.
Strong Resale Value
The Fat Bob holds its value exceptionally well compared to other cruisers, often retaining 70-80% of its value after 3 years. Its aggressive dual-headlight styling keeps demand consistently high in the used market.
Milwaukee-Eight Upgrade
2018+ Fat Bobs switched to the Milwaukee-Eight 107 engine, a significantly more reliable and smoother platform with improved oil cooling and reduced vibration. Buyers should strongly prioritize this generation over earlier models.
Generations & Specs by Year
Introduced dual headlights, blacked-out engine, wide front tire, raw bobber styling on Dyna platform.
"Mean-looking bruiser that actually handles better than expected."
The Fat Bob is the Dyna chassis doing its best work — that rubber-mounted Twin Cam 96 pulls hard from 2,500 rpm and the wide 180-section front tire gives the whole bike a planted, purposeful feel that the Softail crowd never gets. I've done 500-mile days on mine and the low 686mm seat is genuinely comfortable for a medium-height rider, though the dual headlights are more aesthetic statement than actual night illumination — they're embarrassingly dim by modern standards. The blacked-out engine and raw bobber stance age surprisingly well, but at 302kg wet you feel every kilo in slow parking-lot maneuvers and the stock suspension is tuned for someone who weighs nothing and hits no bumps. Vibration through the footpegs above 100 km/h is real and constant, which either becomes part of the charm or slowly drives you insane depending on your personality.
Pros
Cons
Moved to Softail platform with Milwaukee-Eight engine, improved suspension, revised frame and ergonomics.
Used Buyer Review
"Raw, honest American muscle that rewards careful used-buying diligence."
$7,500-$14,000 usedThe Fat Bob is one of Dyna's most characterful machines — that wide 21-inch front wheel and dual headlights give it a genuinely menacing street presence that ages well. The Twin Cam 96 or 103 engine is bulletproof if it's been maintained, and most Fat Bobs have seen decent miles without drama. Check the cam chain tensioners on pre-2006 bikes though — that's the one known Achilles heel that can turn into an expensive rebuild if ignored. Riding position is aggressive for a Harley, feet forward but not stupidly so, and the thing actually handles reasonably well for something this heavy. Don't expect sporting dynamics, but it won't embarrass you on twisty roads either. Vibration through the pegs is real above 70mph — that's not a fault, that's a Dyna. Budget for new tires almost immediately on anything used, and inspect the rear isolator mounts religiously. They crack silently and the handling goes sideways fast.
Top 10 Accessories
Curated picks for the Harley-davidson Dyna Fat Bob — owned, ridden, recommended.
Common Problems
🔥 2 CRITICALListen for clunking on cold start at idle
Ticking noise, check service history for upgrade
Excessive vibration, inspect rubber mounts visually
Check battery voltage at idle, look for burnt wiring
✅Pre-Purchase Checklist
Solid bike, maintain cam system religiously
Full Specifications
Rivals & Alternatives
Bikes that buyers cross-shop with the Harley-davidson Dyna Fat Bob
Harley-davidson Dyna Low Rider
Harley-davidson Dyna Street Bob
Harley-davidson Dyna Super Glide
Harley-davidson Dyna Wide Glide
Harley-davidson Fat Bob 114
Compare Harley-davidson Dyna Fat Bob Side-by-Side
compare_arrowsSpecs, power, weight & buyer verdict — head-to-head with the bikes most often cross-shopped.
Harley-davidson Dyna Fat Bob vs Harley-davidson Dyna Low Rider
Specs · Power · Buyer verdict
Harley-davidson Dyna Fat Bob vs Harley-davidson Dyna Street Bob
Specs · Power · Buyer verdict
Harley-davidson Dyna Fat Bob vs Harley-davidson Dyna Super Glide
Specs · Power · Buyer verdict
Harley-davidson Dyna Fat Bob vs Harley-davidson Dyna Wide Glide
Specs · Power · Buyer verdict
Harley-davidson Dyna Fat Bob vs Harley-davidson Fat Bob 114
Specs · Power · Buyer verdict
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Discussion
Frequently Asked Questions
What are common problems with the Harley-davidson Dyna Fat Bob? +
Primary chain tensioner wear causes clunking noise: Listen for clunking on cold start at idle (moderate) | Cam chain tensioner failure on Twin Cam engines: Ticking noise, check service history for upgrade (serious) | Rear isolator mount bushing deterioration: Excessive vibration, inspect rubber mounts visually (moderate)
Is the Harley-davidson Dyna Fat Bob a good motorcycle? +
Raw, honest American muscle that rewards careful used-buying diligence. Rating: 7.8/10. Best for: Experienced riders wanting authentic V-twin character daily. Avoid if: New riders intimidated by weight and maintenance costs.
What is the horsepower of the Harley-davidson Dyna Fat Bob? +
The Harley-davidson Dyna Fat Bob produces 68 hp @ 5,500 rpm (note: estimated for 96ci Twin Cam; 103ci variant approx. 73 hp), with 112 Nm @ 3,500 rpm (Twin Cam 96; 103ci approx. 119 Nm) of torque. Top speed: 185 km/h.
Is the Harley-davidson Dyna Fat Bob good for beginners? +
Yes — the Harley-davidson Dyna Fat Bob is a reasonable choice for new riders (68 hp is manageable), weighing 305 kg. Experienced riders wanting authentic V-twin character daily
Is the Harley-davidson Dyna Fat Bob reliable? +
Owners report 2 critical issues to watch for on the Harley-davidson Dyna Fat Bob, notably: Cam chain tensioner failure on Twin Cam engines (Ticking noise, check service history for upgrade). Buy with a pre-purchase inspection.
Is the Harley-davidson Dyna Fat Bob good for daily use? +
Experienced riders wanting authentic V-twin character daily Fuel: 5.5 L/100km (approx. 18 km/L, real-world average for 2008-2017 Dyna Fat Bob).
How fast is the Harley-davidson Dyna Fat Bob? +
The Harley-davidson Dyna Fat Bob reaches a top speed of 185 km/h, producing 68 hp at 305 kg curb weight. Real-world performance depends on rider weight, gearing, and road conditions.
What gear should I buy for a Harley-davidson Dyna Fat Bob? +
Motoryk has curated a Top 10 gear list specifically for the Harley-davidson Dyna Fat Bob, covering engine oil, tires, chain, battery, and brake pads — see motoryk.com/bikes/harley-davidson/dyna-fat-bob/top10. Each pick is matched to this bike's spec.
