Quick Analysis
Harley Davidson Fat Boy
16.5 pts
Unweighted: 12 advantages
EnginePerformanceDimensionsBrakesTyresFeaturesOther
KTM 390 ADVENTURE X
17.0 pts
Unweighted: 12 advantages
EnginePerformanceDimensionsBrakesTyresFeaturesOther
| Specification | ||
|---|---|---|
Engine Specifications |
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| Cooling System | Air-cooled | Liquid Cooled |
| Displacement | 1,923 cc | 398.63cc |
| Engine Type | Milwaukee-Eight™ 117 Custom | 4-Stroke, Single Cylinder, DOHC |
| Power | 103 HP / 77 kW @ 5020 rpm | 46 PS @ 8500 RPM |
| Torque | 168 Nm @ 3000 rpm | 39 Nm @ 6500 RPM |
Performance & Efficiency |
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| Fuel Tank Capacity | 18.9 litres | 14.5 |
| Mileage | 18.18 Kmpl | 30 kmpl |
Dimensions & Weight |
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| Kerb Weight | 315 | 181 |
| Seat Height | 675 | 825 |
Brakes & Suspension |
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| ABS | Dual-channel ABS | Switchable ABS |
| Front Brake | Disc | Disc 320mm |
| Front Suspension | Dual-bending valve 49 mm telescopic with aluminum fork triple clamps, dual rate spring | WP APEX USD forks, 43 mm diameter, 200mm travel |
| Rear Brake | Disc | Disc 240mm |
| Rear Suspension | Hidden, free piston, coil-over monoshock; 43mm stroke, hydraulic preload adjustment | WP APEX Monoshock, 205mm wheel travel Adjustable for Preload (10 steps) |
Tyres & Wheels |
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| Front Tyre | 160/60 R18 | 100/90 - 19 |
| Rear Tyre | 240/40 R18 | 130/80 - 17 |
| Tyre Type | Tubeless | Tubeless |
| Wheel Type | Cast aluminum (Lakester) | Alloy |
Features & Technology |
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| Headlight | LED | LED headlamp |
Other Specifications |
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| Battery | — | 12V / 8AH |
| Bike Image 1 | https://motoautiv.com/wp-content/uploads/2025/06/Blue.avif | https://motoautiv.com/wp-content/uploads/2025/11/KTM-390-Adventure-X_White.webp |
| Bike Image 2 | https://motoautiv.com/wp-content/uploads/2025/06/Grey.avif | — |
| Bike Image 3 | https://motoautiv.com/wp-content/uploads/2025/06/Whiskey-fire.avif | — |
| Cluster | Analog with LCD | — |
| Color Options | Billiard Gray | #6B7074 Vivid Black | #0F0F10 Blue Burst | #1E4D8C Whiskey Fire / Vivid Black | #7A2D1B, #0F0F10 | Electronic Orange | #FF5F00 Ceramic White | #F2F2F2, #FF5F00 |
| Cons | The Weight Is Impossible to Ignore – Parking, reversing, or making tight U-turns requires more effort than on most motorcycles. The bike feels considerably lighter once moving, but the weight is always present at low speeds. Not a Motorcycle That Enjoys Tight Corners – The Fat Boy is happiest on flowing roads. When the road becomes tight and twisty, its size and geometry become more noticeable. Wind Hits You Directly at Highway Speeds – Without a fairing or windscreen, long highway rides can become tiring because the rider takes the full force of the wind. Can Feel Warm in Traffic – Sitting in slow-moving traffic on a hot day makes the large V-twin's heat more noticeable around the legs. Passenger Comfort Is Average – The stock setup feels more focused on the rider. For frequent two-up riding, many owners look at accessory seats and backrests. Not Built Around Practicality – There is no meaningful storage space, and carrying luggage usually requires additional accessories. Running Costs Are Higher Than Average – Tyres, servicing, insurance, and genuine accessories can all add up compared to smaller motorcycles. Requires Some Experience to Get the Best Out of It – The combination of weight, engine size, and physical dimensions can feel intimidating for riders who are new to large-capacity cruisers. Floorboards Touch Down Earlier Than You Might Expect – Riders who push harder through corners will eventually find the limits of the cruiser-style setup. | Tall Seat Height: At 825 mm, the seat may be uncomfortable or difficult to reach for shorter riders, especially off-road. Lack of Cornering ABS: Unlike the standard 390 Adventure, the X variant skips cornering ABS, which reduces safety margin when leaning hard. Limited Traction Control: Fewer electronic aids compared to higher-spec ADVs, could be less forgiving on unpredictable terrain. Vibrations at High RPMs: The single-cylinder engine can produce noticeable vibrations when pushed hard, affecting comfort. Moderate Wind Protection: The windscreen and fairing design might not deflect wind strongly enough at high speeds. Suspension Can Feel Harsh on Pavement: While great off-road, the long-travel suspension may feel firm or bouncy on uneven city roads. Maintenance Cost: Premium suspension components and tech might lead to higher service costs compared to simpler commuter bikes. Limited Pillion Comfort: The seat design and limited rear padding may not provide much comfort for a passenger over long distances. |
| Detailed Overview | Even among Harley-Davidson’s own motorcycles, the Fat Boy has always been difficult to mistake for anything else. The solid-disc Lakester wheels, broad fuel tank, chunky tyres, and low stance give it a silhouette that looks substantial from every angle. While many cruisers rely on chrome and visual complexity to create an impression, the Fat Boy’s design is built around simple, oversized elements that have remained part of its identity for decades. The motorcycle is based on Harley-Davidson’s Softail platform, which uses a hidden rear suspension arrangement beneath the seat area. From the side, the frame still resembles the rigid hardtail cruisers that inspired it, but underneath there is a modern monoshock setup responsible for absorbing road imperfections. The front suspension uses telescopic forks designed to support the motorcycle’s considerable weight while maintaining stability over varying road surfaces. A 1,923cc Milwaukee-Eight 117 V-twin engine sits prominently in the center of the motorcycle. Rather than encouraging riders to explore the upper reaches of the rev range, the engine develops much of its performance lower down, which influences how the Fat Boy behaves in everyday riding. The motorcycle can accelerate with relatively little throttle input, and the six-speed gearbox allows the engine to remain relaxed during highway travel. The large displacement and V-twin configuration are also major contributors to the motorcycle’s mechanical character and riding feel. Dimensionally, the Fat Boy is a substantial machine. Wide tyres at both ends, a long wheelbase, and a low seat height all contribute to its proportions. The low seating position places the rider close to the ground, while forward-mounted foot controls create the stretched riding posture commonly associated with large American cruisers. Combined with the wide handlebar, the rider’s position is very different from what would be experienced on a roadster or sport motorcycle. The Lakester wheels remain one of the defining visual features of the Fat Boy. Unlike conventional alloy wheels, their solid-disc-inspired design creates a unique appearance that has become closely associated with the model over the years. Alongside the broad tyres and muscular bodywork, these wheels play a significant role in shaping the motorcycle’s overall identity. Technology is present, although it is integrated more discreetly than on Harley-Davidson’s touring motorcycles. Modern versions include selectable riding modes, traction control, and ABS, with certain markets also receiving cornering-sensitive rider-assistance systems. Instead of a large touchscreen display, the Fat Boy uses a compact instrument setup focused primarily on essential riding information. An 18.9-litre fuel tank sits above the engine and forms one of the largest visual elements of the motorcycle. Lighting throughout the motorcycle uses LED technology, while the overall design remains intentionally uncluttered. There are few body panels, minimal visual distractions, and a clear emphasis on exposing the mechanical components that define the motorcycle. The Fat Boy’s specifications reveal a motorcycle shaped around traditional cruiser principles: a large-capacity V-twin engine, long-wheelbase chassis, low seating position, and substantial physical presence. Although modern electronics and engineering have been incorporated over time, the underlying layout remains closely tied to the formula that has defined the model for decades. | There are some motorcycles that feel layered with features, and then there are ones like the KTM 390 Adventure X, where the focus shifts more towards the core mechanical setup. It uses a 373cc single-cylinder, liquid-cooled engine that produces around 46 PS and 37 Nm of torque, paired with a 6-speed gearbox along with a slipper clutch and quickshifter. At lower speeds, the engine feels slightly restrained, but as the revs build, it starts to respond more actively, which becomes noticeable on open roads where maintaining higher speeds feels more natural. The bike is built on a steel trellis frame, supported by long-travel suspension at both ends. It gets upside-down forks at the front and a monoshock at the rear, tuned to keep the bike stable over varying surfaces. On smoother roads and highways, the setup feels composed, while on broken patches or sharp bumps, especially at lower speeds, some of the impact comes through. With around 200 mm of ground clearance, the bike can handle speed breakers and uneven roads without much concern. The riding position is upright and fairly relaxed. A wide handlebar, neutral foot peg placement, and a flatter seat help create a posture that does not put much pressure on the rider, even over longer distances. The seat height is around 825 mm, which makes it slightly more accessible compared to the standard version, especially in city riding conditions. The kerb weight is close to 177 kg, and once the bike is in motion, it feels balanced and predictable. Braking is managed by disc brakes at both ends, supported by dual-channel ABS. The setup provides a consistent and controlled braking feel in regular riding situations. The bike rides on a 19-inch front wheel and a 17-inch rear wheel, both with tubeless tyres, a combination that keeps it stable on uneven roads while still being more suited to paved surfaces. The instrument cluster is a digital unit that shows basic riding information like speed, fuel level, gear position, and trip data in a clear layout. Compared to the standard version, the Adventure X keeps things simpler by not including features like traction control or riding modes. The focus remains on essential functionality rather than additional electronic layers. With a fuel tank capacity of around 14.5 litres, the bike offers a usable range for both daily use and longer rides. It also comes with LED lighting and a windscreen that helps reduce wind impact to some extent at higher speeds. Overall, the KTM 390 Adventure X is structured around its engine, chassis, and suspension, keeping the riding experience straightforward while still covering a mix of city roads, highways, and occasional rough surfaces. |
| Expert Review | The Fat Boy has always been a motorcycle that prioritizes presence as much as performance. Even by cruiser standards, it feels substantial, whether you're looking at it parked or riding it down the road. The Milwaukee-Eight 117 engine suits the character of the bike perfectly, producing the kind of effortless torque that allows you to ride without constantly thinking about gear selection or engine speed. What stands out most is how planted the motorcycle feels once it's moving. The wide tyres, long wheelbase, and considerable weight create a sense of stability that encourages a relaxed riding style rather than an aggressive one. At the same time, those same traits mean the Fat Boy asks for a bit more effort in slow-speed situations and doesn't feel particularly eager when the road becomes tight and technical. The riding experience is less about chasing performance figures and more about the way the motorcycle delivers its power, carries its weight, and settles into a steady rhythm on open roads. Modern electronics have improved safety and usability, but they remain secondary to the traditional cruiser character that continues to define the Fat Boy., 4.4, MotoAutiv Team | The KTM 390 Adventure X is powered by a 373cc single-cylinder, liquid-cooled engine producing around 43–45 bhp and 37 Nm, paired with a 6-speed gearbox along with a slipper clutch and quickshifter. The engine feels slightly dull at lower RPMs but picks up strongly in the mid-range, making highway riding feel effortless, while in city conditions it requires more gear shifts to stay smooth. It uses a steel trellis frame with long-travel suspension that is tuned on the firmer side, offering stability at higher speeds but transmitting sharper bumps at lower speeds. The upright riding posture, wide handlebar, and 825 mm seat height make it relatively accessible, while the bike remains balanced once in motion. Braking is handled by disc brakes with dual-channel ABS, offering consistent stopping performance. Compared to the standard version, it comes with a simpler electronics setup, missing features like traction control and riding modes, but still includes essentials like a TFT display and quickshifter. With a 14.5-litre fuel tank and road-focused wheel setup, it is designed for highway use along with occasional rough roads., 4.3, MotoAutiv Team |
| FAQ (Manual Override) | Q: What type of motorcycle is the Harley-Davidson Fat Boy? A: The Fat Boy is classified as a heavyweight cruiser motorcycle, designed around relaxed riding ergonomics, a large V-twin engine, and long-distance road comfort. Q: Which engine powers the Fat Boy? A: The latest model uses the Milwaukee-Eight 117 V-twin engine paired with a 6-speed gearbox. Q: Is the Fat Boy suitable for long-distance rides? A: Yes. The relaxed ergonomics and torque-rich engine make it capable of covering long distances, although many owners add touring accessories for greater comfort. Q: What is the seat height of the Fat Boy? A: The seat height is approximately 675 mm, making it accessible to a wide range of riders. Q: Does the Fat Boy have cruise control? A: Availability depends on market and model year. Some versions include cruise control, while others may offer it as an accessory. Q: What is the fuel tank capacity of the Fat Boy? A: The motorcycle is equipped with an 18.9-litre fuel tank. Q: Does the Fat Boy have riding modes? A: Yes. Modern versions include selectable riding modes and electronic rider-assistance systems. Q: Is the Fat Boy comfortable for a passenger? A: Occasional two-up riding is possible, but the stock setup is more rider-focused than dedicated touring motorcycles. Q: How is the Fat Boy different from the Breakout? A: The Fat Boy focuses on a broad, muscular cruiser character with solid-disc wheels, while the Breakout adopts a stretched custom-cruiser design with a much wider rear tyre. Q: Does the Fat Boy have traction control and ABS? A: Yes. Modern versions include ABS, traction control, and other rider-assistance technologies. Q: What is the kerb weight of the Harley-Davidson Fat Boy? A: The motorcycle weighs approximately 315 kg in running condition, depending on market specification. Q: Is the Fat Boy beginner-friendly? A: The low seat height helps with accessibility, but the weight, engine size, and overall dimensions make it better suited to riders with some experience. Q: Does the Fat Boy support smartphone connectivity? A: The Fat Boy uses a relatively simple instrumentation setup compared to Harley's touring models, so smartphone integration is limited. Q: What body type does the Fat Boy belong to? A: It is categorized as a cruiser motorcycle, specifically a heavyweight cruiser designed around comfort, torque delivery, and road presence. | Q: What is the engine specification of the KTM 390 Adventure X? A: The 390 Adventure X is powered by a single-cylinder, liquid-cooled engine. According to KTM India, its displacement is 398.63 cc, producing 46 PS @ 8,500 rpm and 39 Nm torque @ 6,500 rpm. Q: What type of transmission does KTM 390 Adventure X use? A: It uses a 6-speed gearbox, according to KTM’s technical specs. Q: What is the fuel tank capacity and the expected range of KTM 390 Adventure X? A: The Adventure X comes with a 14.5 litre fuel tank. This gives it decent range for touring, especially when combined with its efficient engine. Q: What is the seat height and ground clearance of KTM 390 Adventure X? A: The seat height is 825 mm, according to several official sources. The ground clearance is 228 mm, which helps its off-road credentials. Q: What suspension setup does the 390 Adventure X use? A: It features WP APEX 43 mm USD front forks with 200 mm of travel, and a WP APEX monoshock at the rear. Q: What brakes and ABS features are on KTM 390 Adventure X? A: The bike uses a 320 mm front disc and 240 mm rear disc, per KTM’s spec sheet. It also offers switchable ABS, including an Off-Road mode, but does not have cornering ABS on this X variant. Q: What electronic rider aids are offered in KTM 390 Adventure X? A: The Adventure X includes Ride-by-Wire throttle, a Quickshifter+, and switchable off-road ABS. Unlike the standard 390 Adventure, it doesn't include features like cornering ABS or full traction control (MTC). Q: What does the instrument panel look like in KTM 390 Adventure X? A: It comes with a 5-inch TFT display that provides essential ride information and adapts to ambient light. Q: Is the KTM 390 Adventure X good for off-road riding? A: Yes, with its 19″ front / 17″ rear wheel setup, high ground clearance, and off-road ABS, it’s designed to tackle dirt trails and gravel while remaining very capable on-road. Q: What is the kerb / wet weight of KTM 390 Adventure X? A: The kerb (fully fueled) weight is around 176 kg, per KTM’s UK technical spec sheet. Q: What is the rated fuel efficiency / mileage of KTM 390 Adventure X? A: The mileage is claimed to be around 30 km/l for the 390 Adventure X. Some real-world owners report 21–25 km/l, depending on conditions. Q: Are there some known issues or drawbacks reported by owners? A: Yes, several riders mention vibrations at higher RPMs, particularly in the footpegs and handlebar. Also, some users believe KTM has compromised on certain parts quality (e.g., the side stand assembly) to cut costs. |
| Fuel System | Fuel Injection | Fuel Injection |
| Price Variants | STD | 2803000 | STD | 343250 |
| Pros | Instantly Recognizable Design – Few motorcycles are as easy to identify from a distance as the Fat Boy. The solid-disc wheels, wide stance, and muscular proportions give it a presence that stands out even among other cruisers. Torque-Rich Engine Character – The Milwaukee-Eight 117 doesn't need to be revved hard to make progress. A small twist of the throttle is usually enough to get the bike moving with very little effort. Relaxed Riding Position – The low seat, wide handlebar, and stretched-out foot controls create a laid-back riding posture that suits cruising and long hours in the saddle. Feels Stable on Open Roads – Once the bike is moving, its weight starts working in its favour. It feels planted at highway speeds and doesn't get unsettled easily. High-Quality Finish – From the paintwork to the chrome detailing and metal components, the overall fit and finish reflects the premium nature of the motorcycle. Low Seat Height Helps at Stops – Despite being a large motorcycle, the low seat makes it easier for many riders to place both feet firmly on the ground. Modern Electronics Without Changing the Character – Features such as ABS, traction control, and riding modes work in the background without taking away from the traditional cruiser feel. Comfortable Engine for Cruising – The engine settles into a relaxed rhythm at highway speeds and rarely feels stressed during normal riding. | Lightweight & Nimble: Being a small-displacement ADV, it’s easier to manage than larger dual-sport bikes, making it ideal for both urban and trail use. Good Power for Class: Its ~398 cc single-cylinder engine provides enough punch for highway cruising and off-road sections without being too intimidating. Long-Travel Suspension: Equipped with WP APEX USD forks and a capable rear monoshock, it offers very good travel for handling rough terrain. High Ground Clearance: With around 228 mm of ground clearance, the 390 Adventure X is well-suited for mild to moderate off-road trails. Off-Road ABS Mode: Switchable ABS allows the rear wheel to slide slightly in off-road mode, which provides more control on loose surfaces. Modern Tech Features: Features like Quickshifter+, ride-by-wire throttle, and a 5-inch TFT display add a premium, tech-savvy feel. Good Fuel Range: With a 14.5 L fuel tank and decent efficiency, it offers a respectable touring range for a mid-sized ADV. Durable Build: Trellis frame and quality components contribute to its rugged build, making it reliable for adventure rides. |
| Starter | Electric | Self Start Only |
| Transmission | 6-speed manual | 6 Speed Manual |
