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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Choose the Ducati Diavel V4 if your priority is a sport-oriented muscle-roadster character, substantially higher published peak horsepower and modern performance electronics. Choose the 2026 Harley-Davidson Fat Boy if you want a lower seat, heavyweight cruiser stance, a large-displacement V-twin, higher published torque and a lower listed starting price. Neither is objectively better for every rider. The figures below are manufacturer specifications for the US market, not the result of a controlled head-to-head road test. Sit on and ride both before deciding.
At a glance: two very different answers to the muscle-bike brief
The Diavel V4 and Fat Boy occupy similar visual territory—large, attention-grabbing motorcycles with broad rear tires—but they deliver that idea through different engineering priorities. Ducati uses a liquid-cooled 90-degree V4 and a sport-bike-style electronic package. Harley-Davidson uses its Milwaukee-Eight 117 Custom V-twin, a low-slung chassis and the visual language of a traditional American cruiser.
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That distinction matters more than a simple horsepower ranking. A rider shopping for brisk, high-rpm performance and aggressive roadster responses will read the Ducati’s specification sheet differently from a rider who values an easy-to-reach seat, relaxed cruising posture and a substantial V-twin presence. The useful question is not “which one wins?” but “which set of compromises suits my roads, body and budget?”
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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minute| Specification (US-market pages) | Ducati Diavel V4 | 2026 Harley-Davidson Fat Boy |
|---|---|---|
| Listed starting price | $27,995 in Ducati Red; $28,995 in Black Roadster Livery, plus a $1,295 destination charge | $22,599+ starting MSRP |
| Engine | 1,158 cc liquid-cooled 90-degree V4 Granturismo | Milwaukee-Eight 117 Custom V-twin |
| Published peak power | 168 hp at 10,750 rpm | 103 hp at 4,800 rpm |
| Published peak torque | 93 lb-ft at 7,500 rpm | 126 ft-lb at 3,000 rpm |
| Published mass | 223 kg (492 lb), wet without fuel | 694 lb in running order |
| Seat measurement | 31.1-inch seat height | 25.9-inch laden seat height |
| Front/rear tire specification | Pirelli Diablo Rosso III, 120/70 ZR17 front and 240/45 ZR17 rear | Michelin Scorcher 11, 160/60R18 front and 240/40R18 rear |
| Published fuel economy | Not stated on the retrieved US specification | 47 mpg estimated city/highway, according to Harley-Davidson |
| Warranty listed | 24 months, unlimited mileage | Not stated in the supplied 2026 US page information |
The labels are not perfectly comparable: Ducati reports wet weight without fuel, while Harley-Davidson reports running order, and Ducati gives an ordinary seat height while Harley-Davidson gives a laden seat height. Do not treat the raw differences as a laboratory weight or reach test.
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Price and what the sticker numbers really include
Ducati Diavel V4 pricing
Ducati’s current US listing shows $27,995 for Ducati Red and $28,995 for Black Roadster Livery. A $1,295 destination charge is additional. The listed MSRP excludes taxes, title, registration, options, processing and handling, dealer charges and any potential tariffs. The final selling price is set by the dealer, so obtain a written out-the-door quote rather than budgeting from the headline alone.
The color surcharge is $1,000 before the destination charge and other fees. If you are comparing motorcycles by monthly payment, include the same down payment, term, interest rate, tax treatment and dealer fees for both bikes; otherwise a lower monthly figure can simply reflect different financing assumptions.
2026 Fat Boy pricing
Harley-Davidson lists the 2026 Fat Boy at a $22,599+ starting MSRP on its US page. The plus sign indicates that the displayed figure is a starting point, not an all-in transaction price. Confirm local taxes, freight or destination charges, documentation fees, registration and the actual price of available inventory with a Harley-Davidson dealer.
How to compare the two offers
- Ask each dealer for an itemized out-the-door price for the exact color and equipment.
- Separate mandatory charges from optional accessories, protection products and extended coverage.
- Confirm whether the motorcycle in stock is the stated model year and whether any regional equipment differs from the web page.
- Compare insurance quotes using the vehicle identification number or exact trim; premium differences can outweigh a modest MSRP gap.
- Keep a reserve for riding gear, a first service, registration and replacement tires.
On listed US MSRP alone, the Fat Boy starts below the Diavel V4. That is a purchase-price advantage, not proof that its total cost of ownership, financing cost or resale value will be lower; the available manufacturer information does not establish those figures.
Engine output: horsepower and torque answer different questions
Diavel V4: high peak power at higher revs
The Diavel’s 1,158 cc liquid-cooled 90-degree V4 Granturismo is rated at 168 hp at 10,750 rpm and 93 lb-ft at 7,500 rpm. Those figures point to an engine whose published peak arrives at substantially higher engine speeds than the Harley’s. The bike’s specification therefore fits a rider who wants a sport-oriented powerband and is comfortable using revs, gears and the quickshifter to access it.
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Ducati describes the Diavel as combining traits associated with sport nakeds and muscle roadsters. That is manufacturer positioning, not an independent handling verdict, but it accurately explains why the engine output is presented in a performance-oriented context. The numbers do not establish a particular quarter-mile time, roll-on result or top speed.
Fat Boy: greater published torque at low rpm
The Fat Boy’s Milwaukee-Eight 117 Custom is listed at 103 hp at 4,800 rpm and 126 ft-lb at 3,000 rpm. Its peak torque figure is higher than Ducati’s published number and occurs at a much lower engine speed, a combination that suits a relaxed, low-rev cruising brief on paper.
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Do not turn that comparison into “the Harley accelerates harder everywhere.” The manufacturers quote power and torque at different rpm, with different test methods and no shared instrumented comparison in the available material. Horsepower, gearing, throttle calibration, vehicle mass and traction all influence acceleration. A test ride is the only dependable way to judge how either engine feels to you in traffic, on a highway on-ramp or while overtaking.
What to notice on a test ride
- How much clutch slip and throttle movement you need at walking pace.
- Whether the engine response feels smooth or abrupt in the lowest ride mode.
- How naturally the seating position lets you shift your weight while cornering.
- Whether the vibration, intake and exhaust character is enjoyable at the speeds you actually ride.
- How easy it is to select the gear you want and maintain a steady speed on the highway.
Size, weight and seat height: fit can decide the purchase
Seat reach
Ducati lists a 31.1-inch seat height for the Diavel V4. Harley-Davidson lists a 25.9-inch laden seat height for the Fat Boy. That is a substantial difference in the published measurements, although the terminology differs. Riders with shorter inseams may find the Fat Boy easier to manage at stops, while taller riders may prefer the Ducati’s higher perch for legroom. Only a physical sit-down can reveal how the seat width, suspension sag, boot sole and your inseam combine.
Mass and maneuvering
The Diavel is listed at 223 kg (492 lb) wet without fuel. The Fat Boy is listed at 694 lb in running order. Because one figure excludes fuel and the other represents a ready-to-ride condition, subtracting them as if they were measured identically would be misleading. Even so, the Harley’s published running-order figure signals a heavyweight motorcycle; the Ducati’s figure signals a considerably lighter design brief.
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Weight is most noticeable when you push a motorcycle backward, catch it on a sloped driveway or make a tight U-turn, not just when it is moving at speed. During your appointment, perform a controlled feet-up crawl, a full-lock turn and a parking-lot stop on both motorcycles. Check whether you can place at least one foot securely without leaning the bike beyond your comfort zone.
Riding position and use
The Diavel’s roadster concept generally places the rider in a more active relationship with the front end. The Fat Boy’s low seat and cruiser proportions emphasize a planted, laid-back stance. The exact bar, peg and seat relationship should be assessed on the specific stock motorcycle because accessories or suspension settings can change it.
Electronics and rider aids
Diavel V4 equipment
Ducati lists a five-inch TFT display, cruise control, riding modes, power modes, Quick Shift up/down, Cornering ABS, Ducati Traction Control and Ducati Wheelie Control. These systems let you tailor throttle response and intervention to conditions, while the quickshifter can reduce clutch use during acceleration and deceleration.
Electronic assistance is not a substitute for correct tires, smooth inputs or training. Ask the dealer to demonstrate how to select modes, what each mode changes and whether settings persist after the ignition is cycled. Learn the warning-light behavior before your first long ride.
2026 Fat Boy equipment
Harley-Davidson describes the 2026 Fat Boy with ride modes, full LED lighting and Rider Safety Enhancements. The listed safety equipment includes ABS, traction control, drag-torque slip control, tire-pressure monitoring and cornering-enhanced ABS.
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Names and menus are not directly interchangeable between brands. Before comparing “which has more technology,” identify the functions you will actually use: cornering brake intervention, rear-wheel slip control, low-fuel information, cruise control and the visibility of the display in sunlight. A feature that is difficult to access or understand has less practical value than one you can confidently set.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Fuel economy, range and routine ownership
Fuel economy evidence
Harley-Davidson gives 47 mpg as an estimated city/highway figure for the 2026 Fat Boy. It is a manufacturer estimate, not a result from a matched real-world comparison. The retrieved Ducati US specification does not provide a comparable fuel-economy number, so no defensible mpg winner can be declared.
Your usable range will also depend on tank capacity, riding speed, temperature, passenger load, tire pressure and how often you use the engine’s performance. If long stretches between fuel stops matter, ask each dealer for the current tank-capacity specification and calculate range from your own observed consumption after purchase.
Service intervals for the Ducati
Ducati lists annual service, an oil service at 9,000 miles or 24 months and a valve-clearance check at 37,000 miles. Confirm the schedule that applies to your exact model year and market with a local dealer; market-specific requirements and software updates can alter what is due.
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The available information does not establish comparative maintenance prices, reliability, heat management, insurance rates, resale value, long-term durability or ownership satisfaction. Those costs vary by labor rate, location, mileage, riding conditions and owner behavior. Request service estimates for the first scheduled visit and the major valve inspection from nearby dealers before signing a purchase order.
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Tires and consumables: important details for real budgets
Diavel V4 fitment
Ducati specifies Pirelli Diablo Rosso III tires in 120/70 ZR17 at the front and 240/45 ZR17 at the rear. The wide rear size can be expensive and less widely stocked than common touring dimensions. Order by the complete size, speed rating and model-year fitment, and verify the tire manufacturer’s application data before mounting an alternative.
Fat Boy fitment
Harley-Davidson specifies Michelin Scorcher 11 tires in 160/60R18 front and 240/40R18 rear for the 2026 Fat Boy. Confirm that a replacement carries the correct load and speed ratings and is approved for the motorcycle. Do not assume a tire that shares the diameter will have the correct profile, clearance or handling characteristics.
Budgeting for replacements
- Get installed prices, not just online tire prices; mounting, balancing, valve stems and disposal add to the bill.
- Ask how quickly the shop can obtain the exact rear size.
- Inspect tread and age before a used or dealer-demo purchase.
- Follow the motorcycle and tire maker’s pressure guidance, checking pressures cold.
Which bike suits which rider?
Choose the Diavel V4 when…
- You want the higher published peak horsepower figure and a sport-roadster presentation.
- You value a five-inch TFT, cruise control, up/down quickshifting and multiple electronic control systems.
- A 31.1-inch seat is comfortable for your inseam and you can manage a taller motorcycle at stops.
- You accept the higher listed MSRP and Ducati’s additional destination charge.
- You expect to spend time exploring winding roads rather than treating the motorcycle solely as a low-speed boulevard cruiser.
Choose the Fat Boy when…
- A 25.9-inch laden seat is a major confidence or accessibility advantage.
- You want a heavy, visually traditional cruiser with a Milwaukee-Eight 117 V-twin.
- The published 126 lb-ft at 3,000 rpm torque figure and low-rev character appeal to you.
- The $22,599+ starting MSRP fits your budget better than the Ducati’s listed price.
- You prefer Harley-Davidson’s ride-mode and Rider Safety Enhancements package, including TPMS and cornering-enhanced ABS.
When neither is the right answer
If you regularly carry a passenger or luggage, compare passenger-seat size, grab handles, accessory capacity and suspension adjustment in person. If you are a newer rider, either motorcycle’s size and output may be more than you need; a lighter, less powerful machine can be easier to learn on. If your priority is all-day comfort, neither specification table can predict pressure points, wind exposure or heat for your body. Arrange a ride long enough to reveal those issues.
A practical test-ride and purchase checklist
- Verify the motorcycle. Confirm model year, color, standard equipment and vehicle identification number against the written quote.
- Measure your fit. Sit in normal riding boots, reach both controls, turn the bars fully and lift the bike from the side stand.
- Test low-speed control. Ride at walking pace, stop on an incline and make a tight turn without dabbing repeatedly.
- Evaluate the engine in ordinary traffic. Try the lowest and middle ride modes, a steady highway speed and a controlled overtake where legal.
- Try the controls. Set cruise control if permitted, scroll the display, change modes and check that you can read warnings in daylight.
- Inspect practical details. Look at passenger provisions, steering lock, fueling access, luggage options, tire availability and ground clearance.
- Request ownership numbers. Obtain insurance quotes, scheduled-service prices, tire replacement estimates and financing terms for the exact motorcycle.
- Sleep on the offer. Compare itemized out-the-door totals, not a salesperson’s monthly-payment summary.
Bottom line for a 2026 US buyer
The Ducati Diavel V4 is the stronger match for a rider who defines “better” as sportier intent, 168 hp, a lighter published weight category and a broad suite of performance electronics. The 2026 Harley-Davidson Fat Boy is the stronger match for a rider who defines “better” as an approachable 25.9-inch laden seat, heavyweight cruiser presence, a 126 lb-ft low-rpm torque figure and a lower $22,599+ starting MSRP.
Those are fit-based conclusions from manufacturer data, not a claim that one motorcycle handles, accelerates, runs cooler or costs less to own in every situation. The decisive step is a back-to-back appointment on the exact motorcycles you would buy, followed by an out-the-door quote and a service-and-insurance budget you can live with.
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