This customized Harley-Davidson Softail Fat Boy takes the iconic silhouette of the Fat Boy and transforms it into a radical big-wheel muscle cruiser.

Built with an extensive catalog of Thunderbike parts, it combines bold stance, premium craftsmanship and modern performance upgrades that completely change the character of the motorcycle while keeping its unmistakable Harley DNA.

The transformation is immediately visible thanks to the Thunderbike Big Speed wheels. The setup features a 23-inch front wheel paired with a 21-inch single-sided rear wheel, wrapped in Metzeler Cruisetec 260/35VR21 and Metzeler ME888 130/60B23 tires. The Thunderbike single-side swingarm kit not only exposes the wheel visually, but also gives the Fat Boy a clean, show-bike rear profile. Braking performance is enhanced with a Thunderbike Big Speed 340 mm brake disc, pulley, heavy-duty 1-inch belt, and caliper adapter.

The bike sits lower and more aggressive thanks to a Thunderbike fork lowering kit and Air Ride suspension system. This allows the rider to switch between slammed show-stance and comfortable riding height at the press of a button. Custom steel fenders — a 23-inch front fender and 260 mm rear fender — perfectly contour the oversized wheels and tires, creating a seamless flowing line from front to back.

The cockpit and riding position were upgraded with the Thunderbike Hollywood Light handlebar mounted on an Old Style riser kit, along with Motogadget mo.view Club mirrors. Thunderbike grips, LED stripe turn signals with load equalizer, and multiple axle and swingarm covers complete the detailed finishing touches.

Visual highlights continue across the bodywork with the Thunderbike chin fairing GP Style Long, oval Torque airbox cover, derby and timer covers, ignition coil relocation kit, and tank-to-seat cover. A custom Thunderbike seat base and foam finish off the rear section, giving the Fat Boy a sleek profile while maintaining comfort.

Every element of this build works together to create a high-impact custom Softail Fat Boy that blends big-wheel style, premium Thunderbike engineering, and modern performance parts. The result is a motorcycle built to turn heads whether parked at a show or rolling down the highway — a statement piece in the world of Harley-Davidson custom bikes.

Fat Boy parts

• Thunderbike Big Speed wheel
• Thunderbike Big Speed wheel
• Metzeler Cruisetec Rear Tire 260/35VR21 83V
• Metzeler ME888F Front Tire 130/60B23 M/C TL 65H
• Thunderbike Single-Side Swingarm Kit 21′′ Alu
• Thunderbike License Plate Frame Inside Plate
• Thunderbike License Plate Lighting
• Thunderbike Reflector Inside Plate
• Thunderbike Pulley Big Speed Single Side
• Thunderbike Brake Disc Floated Big Speed 340mm
• Thunderbike Brake Caliper Adapter 300->340mm, left black
• Thunderbike Belt 1′′ heavy duty
• Thunderbike Tele Fork Lowering Kit
• Thunderbike Frontfender Stahl 23′′
• Thunderbike Rear Fender Steel 260 mm
• Thunderbike Seat Plate
• Thunderbike Seat Foam for TB Seat Plate
• Thunderbike Cover Tank to Seat, black
• Thunderbike Ignition Coil Relocation Kit black
• Thunderbike Air Ride Suspension Kit
• Thunderbike Chin Fairing GP Style Long
• Thunderbike Riser Kit Old Style with wireholes
• Thunderbike Handlebar Hollywood Light
• Thunderbike Turn Signals Stripe LED with Housing
• Thunderbike Turn Signal Load Equalizer
• Thunderbike Grips Base Satin black cut
• Thunderbike Front Axle Cover-Set
• Thunderbike Axle Cover Swingarm left
• Thunderbike Axle Cover Swingarm right
• Thunderbike Passenger Footpegs Satin Design
• Thunderbike Airbox Cover Oval Torque TB-Logo
• Thunderbike Timer Cover New Custom
• Thunderbike Derby Cover Torque Logo
• Thunderbike Toppers Base
• Thunderbike Brake caliper cover
• Motogadget mo.view Club Mirror black

La entrada Harley-Davidson Fat Boy – Half Hundred by Thunderbike aparece primero en DARK KUSTOM.

The TB-R 1 is a fully customized Thunderbike Harley-Davidson Breakout that combines premium parts, elegant design, and powerful road presence.

Built by Thunderbike, this Breakout showcases the brand’s unmistakable style with a focus on clean lines, high-quality components, and aggressive stance.

This custom Harley-Davidson Breakout is equipped with the Thunderbike Unbreakable wheels, giving the bike a bold and muscular appearance. The Thunderbike Fork/Front End Kit Unbreakable further enhances the look and handling, creating a perfectly balanced front profile. Forward riding comfort and ergonomics are improved with the Thunderbike Forward Control Kit Base Alu, designed for both performance and style.

The bike also features Thunderbike Phantom 1″ grips, offering excellent control and a refined feel at the handlebars. The Thunderbike Unbreakable headlight gives the front end a distinctive visual signature, while the Thunderbike license plate frame with inside mounting and dedicated plate lighting ensure a clean and minimalist rear design.

A Thunderbike PenHead LED turn signal set provides modern, compact lighting, seamlessly integrated into the build. The rear brake caliper cover with logo adds another custom detail, underlining the craftsmanship behind the project.

As for the paintwork, Ingo Kruse was once again commissioned to give the motorcycle its distinctive appearance, delivering a unique finish that defines the TB-R 1’s character. The headlight, toppers, and Thunderbike’s famous ribbed rocker boxes in bicolor are also newly added components, completing the exclusive look of this custom Breakout.

The TB-R 1 Thunderbike Harley-Davidson Breakout is a premium custom motorcycle built for riders who appreciate high-end craftsmanship, striking aesthetics, and unmistakable Thunderbike DNA.

H-D Breakout parts

• Wheels Thunderbike New Digger (21″ & 23″)
• Fuel Tank Thunderbike GP Style Alu
• Suspension Thunderbike Airride
• Triple Tree Thunderbike Grand Prix
• Handlebars Thunderbike Grand Prix Clip-On
• Aircleaner Thunderbike
• Exhaust Thunderbike (Custom)
• Rear Fender Thunderbike GP Style (GFK)
• Front Fender Thunderbike GP Style
• Headlamp H-D & Thunderbike Headlamp Cap
• Chin Fairing Thunderbike GP Style
• Swingarm Thunderbike Singleside
• Pulley Brake Kit Thunderbike
• Forward Controls Thunderbike V-Tech
• Grips Thunderbike Base Satin mit Toppers

La entrada Harley-Davidson Softail Breakout ‘TB-R1’ by Thunderbike aparece primero en DARK KUSTOM.

The Harley-Davidson Softail Dragster “Silverstone” by Thunderbike is a stunning example of how far custom craftsmanship can go when performance styling meets premium components.

Inspired by racing aesthetics and muscular dragster lines, this Softail build combines aggressive stance, high-end engineering, and a clean silver finish that fully lives up to its Silverstone name. It is not just a customized Harley – it is a statement of style and precision.

Race-inspired design with Grand Prix DNA

The first thing that stands out on the Silverstone Dragster is the Thunderbike GP-Style bodywork. The Front Fender Thunderbike GP-Style and Rear Fender Thunderbike GP-Style 260mm stretch the lines of the bike, emphasizing the massive rear wheel and low-slung silhouette.

The Chin Fairing Thunderbike GP-Style and Fuel Tank Thunderbike Custom GP-Style continue this flowing Grand Prix look, creating a cohesive racing-inspired design from front to back.

To match the sleek body parts, Thunderbike added the Headlamp Cap Thunderbike, enhancing the compact and aggressive front end. The result is a motorcycle with strong track DNA but unmistakable Harley-Davidson character.

Premium controls and cockpit details

Riding position and control components play a big part in the Dragster look. The Silverstone features the Thunderbike Clip-On Grand Prix bicolor handlebar, which places the rider in an aggressive, forward stance.

This is complemented by the Grip Set Thunderbike Base Satin and Toppers Thunderbike Base, adding subtle visual refinement.

For ultimate control, the bike is equipped with Levers Rebuffini hydraulic set with switch, offering precision feel and premium machining quality. Completing the ergonomics setup are the Forward Controls Thunderbike V-Tech, giving the Silverstone the stretched drag-style riding posture.

Custom intake, airbox, and engine accents

Thunderbike continued the Grand Prix theme into the engine area. A Thunderbike Airbox Baseplate works together with the Thunderbike Air Cleaner Airbox Kit and the stylish Airbox Cover Thunderbike Grand Prix. This combination not only enhances performance but also keeps the visual language consistent throughout the build.

The details matter – which is why parts like the Derby Cover Thunderbike Drilled and Ignition Cover Thunderbike New Custom were chosen. These touches reinforce the custom character and highlight the engine as the true heart of the Silverstone Dragster.

Single-sided swingarm and performance braking

One of the most eye-catching elements of the Silverstone build is the Thunderbike Single-Side Swingarm Kit 21”. This conversion exposes the custom rear wheel completely on one side, giving the bike a premium custom-show look while emphasizing the wide rear tire.

Braking performance is handled by a Brembo Radial Monoblock M4 brake caliper. This component comes directly from the high-performance motorcycle world and fits perfectly with the racing-inspired concept of the build.

Suspension, front end, and chassis components

To control power and improve handling, Thunderbike installed the Front End Thunderbike Radial Kit Grand Prix. This works together with the Triple Tree Thunderbike Grand Prix bicolor, providing stiffness, precision steering, and a distinctive visual signature.

The Seat Plate Thunderbike flows neatly into the rear section, completing the dynamic line of the dragster profile. Thunderbike’s design ensures that every component appears intentional and integrated, not simply added on.

Lighting and visual finishing touches

Attention to detail continues with carefully selected lighting elements such as Thunderbike Front Turn Signals and Thunderbike License Plate Lighting, keeping the rear minimalist and clean while remaining street-ready.

The exhaust note plays a major role in the overall experience, and the Thunderbike Exhaust delivers the deep sound and visual presence expected from a custom Harley-Davidson dragster. Custom Thunderbike Wheels complete the look, adding motion even when the bike is standing still.

A complete custom concept

The Harley-Davidson Softail Dragster “Silverstone” by Thunderbike is not just a list of aftermarket parts – it is a coherent concept motorcycle. Every modification supports the central idea: a drag-inspired, Grand Prix-styled Softail that blends elegance with aggression.

La entrada Harley-Davidson Softail Dragster ‘Silverstone’ by Thunderbike aparece primero en DARK KUSTOM.

The Thunderbike RS-O is a great example of how precise German engineering meets bold custom motorcycle design.

It is built on the Thunderbike RS Racing Series Dragster frame and has a very low, aggressive stance that immediately suggests speed and power. Every detail of the motorcycle is carefully designed, and the result is a custom Harley-style drag bike that looks fast even when it is standing still.

Thunderbike is based in Hamminkeln on the Lower Rhine and is one of the best-known custom bike builders in Europe. Their fame grew after they won the AMD European Championship of Custom Bike Building in 2006 with the “Spectacular,” and again in 2008 with “Open Mind.” Even though these bikes were showpieces, Thunderbike follows one clear rule: every motorcycle that leaves the workshop must be rideable. As an official Harley-Davidson dealer and parts manufacturer, they build most components themselves, making them one of the few builders who can truly create motorcycles starting from the frame.

The Thunderbike RS-O is a complete construction based on the RS Racing Series, which is an evolution of the Dragster frame. The goal was simple: create a sporty, flat and powerful line. To achieve this, the frame uses large-diameter tubes for strength, curved 45 mm downtubes, a strong 70 mm steering head with an internal stop, and newly shaped side sections. The result is a compact and muscular motorcycle with a crouched look that seems ready to launch forward.

The RS-O is powered by a Screamin’ Eagle 103 CUI Twin-Cam engine. This engine gives the bike strong acceleration and the classic Harley-Davidson character that riders love. It uses original Harley injection electronics, so it also meets modern exhaust emission standards. Apart from the drivetrain, almost everything else on the motorcycle is made by Thunderbike themselves. Parts are designed, machined, welded and finished directly in their workshop.

The chassis underlines the performance character of the bike. At the front, a TB-RS upside-down fork with 4 degrees of rake gives the motorcycle a compact appearance and precise handling. Thunderbike also produces the handlebars, grips and front fender. A 130 Metzeler tire sits on a TB Vegas Cut 4.5×18″ wheel, and braking is handled by an ABM radial caliper together with a 300 mm TB-Spoke brake disc.

At the rear, a Tricky Air Ride suspension allows the rider to adjust the height and comfort. The single-sided TB RS swingarm holds a massive 10×18″ TB Vegas Cut rim with a wide 280 Metzeler tire. Rear braking is provided by a Nissin six-piston caliper working on a perimeter wave disc. The tank, rear fender and footrests are also Thunderbike in-house creations.

The paintwork gives the RS-O its final personality. The design idea was created by Andreas Bergerforth and airbrush artist Ingo Kruse. The color combination of matte black and orange with racing checkered graphics highlights the drag racing style of the bike. The finish looks clean, fast and very purposeful.

In summary, the Thunderbike RS-O customized Dragster RS frame motorcycle is a true showcase of European custom building. It combines a powerful Screamin’ Eagle Twin-Cam engine, radical dragster styling and a large number of in-house engineered components. For riders and fans who love custom Harley-Davidson motorcycles and full frame builds, the Thunderbike RS-O is an excellent example of what high-quality custom craftsmanship can achieve.

La entrada Harley Screamin Eagle ‘Dragster RS-O’ by Thunderbike aparece primero en DARK KUSTOM.

The custom scene continues to evolve, and few names resonate as strongly in the European custom world as Thunderbike.

Their latest creation, the Harley-Davidson Breakout “R v3.0”, is a stunning fusion of brute strength and precision engineering — a build that redefines the aggressive Softail silhouette with signature Thunderbike style.

At its core lies the OEM Harley-Davidson Softail Breakout frame, a solid foundation renowned for its muscular stance and smooth ride. But Thunderbike has taken it much further, upgrading nearly every visible and functional component with their premium custom parts.

The wheels are the unmistakable Thunderbike Unbreakable design — bold, sharp-edged, and impossible to ignore. They perfectly complement the matching Unbreakable front fork (Gabel), giving the bike a cohesive and high-performance front end.

The Thunderbike TBR fender and tank have also been seamlessly integrated, enhancing the bike’s aggressive lines while maintaining its Harley soul.

From top to bottom, the bike is equipped with Thunderbike’s best:

• Foot controls from the Thunderbike Base Alu series
• Phantom Base Alu grips, precision-milled for optimal control and feel

• Lamps from the Unbreakable line, continuing the bike’s unified design language
• A high-performance Unbreakable air cleaner, delivering both looks and power

Every element, from the smallest bolt to the massive wheels, reflects Thunderbike’s attention to detail and commitment to quality. The “R v3.0” isn’t just a custom bike — it’s a visual and mechanical statement built for those who demand more from their Harley-Davidson.

This is not just another Breakout — this is Thunderbike’s R v3.0. A road-dominating machine born from innovation, built to rule.

La entrada Harley Davidson Breakout ‘R v3.0’ by Thunderbike aparece primero en DARK KUSTOM.

This custom VRSC is powered by a water-cooled Revolution engine that delivers 125 horsepower, providing strong and confident propulsion.

To elevate both appearance and performance, the original series parts were removed and replaced with an extensive selection of Thunderbike components, giving the bike a distinctly aggressive and refined character.

One of the most eye-catching upgrades is the Dr. Jekill & Mr. Hyde exhaust system, equipped with matching headers and short, crisp silencers. This setup not only enhances the overall look but also fits perfectly on all VRSC models with a standard swingarm and tires up to 280 mm. The result is a clean and muscular exhaust line that complements the bike’s dynamic stance.

To improve ergonomics and reinforce its sporty riding position, the builders installed cranked risers together with a Thunderbike Roadstar handlebar. At the rear, Thunderbike’s height-adjustable Air Ride suspension system allows the motorcycle to sit low against the ground when parked, emphasizing its aggressive silhouette, while still offering full adjustability during riding.

Every detail of this build contributes to its bold presence and superior craftsmanship. Key components include Metzeler Marathon tires, Thunderbike Base Rubber forward controls, Thunderbike turn signals and brackets, Base Alu black grips, Circuit 851 mirrors, a short side-mount license bracket, and Thunderbike’s Down & Inside license plate frame.

Further enhancements such as the Thunderbike swingarm modification, widened 9.5 x 18 rear wheel, and Cult-Werk GT tank cover round out the transformation.

With its powerful engine, premium components, and striking custom work, this VRSC build stands as a remarkable example of style and engineering—an unmistakable blend of performance, precision, and custom motorcycle artistry.

La entrada Harley-Davidson Night Rod Custom Bike ‘Sun’ by Thunderbike aparece primero en DARK KUSTOM.

The “Trooper” is built on a Harley-Davidson Breakout and demonstrates just how far the production model can be elevated using high-end custom components.

Its engine, frame, and general layout provide a strong foundation, which has been enhanced with a consistently sporty configuration inspired by the Grand Prix series—topped off with a custom Iron Maiden–themed paint job that gives the bike its name. One of the key highlights is the introduction of the brand-new Pro Performance swingarm, developed specifically for wide Softail frames.

The Trooper retains the powerful cruiser DNA of the Breakout but receives a substantial upgrade in both style and technical capability.

Pro Performance Swingarm

From a technical standpoint, the Trooper sets new benchmarks. For the first time, the Breakout is equipped with the Pro Performance swingarm, a striking and highly engineered structure milled from solid aluminum. This advanced component replaces the original tubular swingarm, bringing a completely new visual and structural identity to the rear end.

The development focused on three primary goals:

• Maximum torsional rigidity
• Sport-oriented lines
• Minimal weight

Designed specifically for wide Softail frames, the solid swingarm arms are hollow-milled and reinforced with an additional cover—mirroring the construction philosophy of modern superbikes.

Its complex geometry is made possible only through state-of-the-art CNC machining, reflecting the high standards required for premium chassis components. As with all safety-relevant parts in the lineup, the Pro Performance swingarm comes with a TÜV certificate, making it a fully legal high-performance upgrade for riders who prioritize function, design, and quality.

Tank, Rear Section & Ergonomics

The bike features an in-house–designed GP aluminum tank, integrating essential components such as the fuel pump and sensors. Beyond its technical functionality, the tank enhances the bike’s silhouette with a shorter, more compact profile, sharp edges, and a dynamic transition into the seating position.

The rear fender and matching seat follow the same Grand Prix design philosophy. The compact fender incorporates discreet LED tail and brake lights, creating a clean and open rear view that highlights the wheel, swingarm, and drive system.

Up front, the GP-style triple clamp with increased rake works in combination with clip-on handlebars mounted directly to the fork stanchions. This setup results in a lower, more active riding posture and significantly improved front-end feedback.

Wheels, Brakes & Chassis

The Trooper rolls on wheels from the Vegas Cut series, known for their straight spokes and distinctive bolt detailing. The sizes remain true to the Breakout category—21″ front and 18″ rear—but both aesthetics and performance are completely redefined.

• At the rear, an integrated pulley brake with an inward-mounted disc reveals an unobstructed view of the wheel.
• At the front, an enlarged 340 mm Vegas Wave brake disc paired with radially mounted calipers delivers stronger braking performance and reinforces the bike’s sport-oriented concept.

Dark Styling

Powder-coated engine components and black DLC-coated fork stanchions contribute to the Trooper’s dark, technical appearance. DLC is among the highest-grade surface treatments available for fork tubes, offering superior durability, low friction, and premium aesthetics.

Fine Details From In-House Production

A wide range of proprietary components completes the transformation:

• Headlamp cap
• Side-mounted license plate holder
• GP front fender
• GP front spoiler
• GP rear fender with integrated turn signals
• Various precision-machined accessories

Each piece is designed to blend seamlessly into the overall concept, emphasizing clean lines and a technical look without appearing as standalone showpieces. The Trooper is not a random collection of custom parts—it is a cohesive, high-performance custom build.

Iron Maiden Paintwork

The paint scheme is a direct tribute to Iron Maiden’s “The Trooper”, created in collaboration with Chiko’s Pinstriping. The multi-layered design merges iconic Iron Maiden imagery with the Grand Prix visual language. The customer’s vision—to express the spirit of Iron Maiden—was perfectly realized in a unique and expressive finish.

• Thunderbike Vegas Cut Wheel
• Thunderbike Vegas Cut Wheel
• Metzeler Cruisetec Rear Tire 260/40VR18 M/C TL 84V
• Thunderbike Brake Disc Floated Wave Vegas 340mm
• Thunderbike Brake Disc Floated Wave Vegas 292mm
• Thunderbike Brake Caliper Adapter Radial 300->340mm left black
• Brembo M4 Radial Brake Caliper front left 108mm black
• Thunderbike Pulley Vegas polished
• Thunderbike Pulley Brake Kit
• Thunderbike Hydraulic clutch Conversion Kit black
• Thunderbike Belt guard black
• Thunderbike Front Axle Cover-Set
• Thunderbike License Plate Frame Inside Plate
• Thunderbike License Plate Lighting
• Thunderbike Reflector Inside Plate
• Thunderbike Rear Fender GP-Style 260 mm
• Thunderbike Seat Plate
• Thunderbike Lowering Kit Shock Stage 2 (30mm)
• Thunderbike Custom Alu Fuel Tank GP-Style
• Thunderbike Tank Mount black
• Thunderbike Chin Fairing GP Style Long
• Thunderbike Timer Cover New Custom
• Thunderbike Airbox Kit Oval
• Thunderbike Airbox Cover Oval TB-S
• Thunderbike Forward Control Kit Phantom long matte black
• Thunderbike Mounting Kit Forward Controls
• Thunderbike Shiftpeg & Brakepeg Satin
• Thunderbike Rider Footpegs V-Tech Design
• Thunderbike Triple Tree Kit Grand Prix bicolor
• Thunderbike Clip-On Handlebars Grand Prix bicolor
• Harley-Davidson Conventional Fork Tubes DLC black
• Thunderbike Turn Signal Load Equalizer
• Thunderbike Turn Signals Stripe LED with Housing
• Thunderbike Ignition Coil Relocation Kit black
• Thunderbike Headlamp Cap black
• Motogadget Mirror mo.view Race left
• Motogadget Mirror mo.view Race right
• Thunderbike Swingarm Pro Performance 260mm raw
• Thunderbike Brake caliper adapter Pro Performance Radial rear black
• Brembo Radial Brake Caliper rear 100mm black
• Thunderbike Front Fender GP
• Thunderbike Grips SP-S satin black cut
• Thunderbike Side Mount Licence Plate Bracket Medium Pro Alu black

La entrada Harley-Davidson Breakout FXBR ‘Trooper’ by Thunderbike aparece primero en DARK KUSTOM.

Thunderbike never misses when it comes to blending performance and design, and the Softail Breakout 117 ‘GP-Suzuka‘ is a perfect example of that precision.

Inspired by the spirit of the racetrack, this build pushes the limits of custom craftsmanship while maintaining the raw soul of Harley-Davidson.

This machine rolls on Thunderbike Grand Prix wheels — a 9.0×21 rear and 4.0×23 front, wrapped in Metzeler Cruisetec 260/35VR21 and ME888F 130/60B23 tires for an aggressive stance and unmatched grip. The Single-Side Swingarm Kit (21″ Alu) exposes that massive rear wheel, emphasizing the performance-driven design.

Braking is handled by a Thunderbike Streetmaster disc paired with a Brembo Radial Monoblock M4 caliper set for precise stopping power. The Triple Tree Kit Grand Prix 2.0 Performance and Stummellenker Set “GP 2.0” give the front end its race-ready attitude.

A Custom Aluminum Fuel Tank (GP-Style) and Airbox Cover Oval Grand Prix add clean, aerodynamic lines, while details like Phantom E Grips, Forward Controls Phantom Contrast Cut, and Stripe LED Turn Signals bring modern performance to the forefront.

Finishing touches such as Motogadget mo.view Race mirrors, Derby & Timer Covers (Drilled), and Hydraulic Clutch Conversion Kit make this Thunderbike masterpiece not only stunning but perfectly tuned for the road.

Parts & Details

• Thunderbike Grand Prix rear wheel 9.0×21
• Thunderbike Grand Prix front wheel 4.0×23
• Metzeler Cruisetec Rear Tire 260/35VR21 83V
• Metzeler ME888F Front Tire 130/60B23 M/C TL 65H
• Thunderbike Brake Disc Streetmaster
• Thunderbike Pulley Grand Prix Single Side
• Thunderbike Stummellenker-Set ′′GP 2.0′′
• Thunderbike Single-Side Swingarm Kit 21′′ Alu
• Brembo Radial Monoblock M4 Caliper Set black
• Thunderbike Triple Tree Kit Grand Prix 2.0 Performance
• Thunderbike Windshield Kit GP
• Thunderbike Front Fender GP Style
• Thunderbike Hydraulic clutch Conversion Kit black
• Thunderbike Airbox Cover Oval Grand Prix
• Thunderbike Phantom E Grips
• Thunderbike Custom Alu Fuel Tank GP-Style
• Thunderbike Turn Signals Stripe LED with housing
• Thunderbike Forward Control Kit Phantom contrast cut
• Thunderbike Rider Footpeg Set SP-S black
• Thunderbike EFI Cover black wrinkle
• Motogadget Mirror mo.view Race left
• Motogadget Mirror mo.view Race right
• Thunderbike Toppers Base
• Thunderbike Derby Cover Drilled contrast cut
• Thunderbike Timer Cover Drilled
• Thunderbike Axle Cover Swingarm right
• Thunderbike Axle Cover Swingarm left

La entrada Harley-Davidson Softail Breakout ‘GP-Suzuka’ by Thunderbike aparece primero en DARK KUSTOM.

We would like to introduce you to a very special duo: the Porsche 911 GT3 RS with the Weissach Package, and the custom Harley-Davidson Softail Breakout built to match it: the Thunderbike GP-Weissach.

Together with our customer Stefan, we created a project that bridges the gap between high-performance automotive engineering and handcrafted custom motorcycle design. This is not our first collaboration with him. Nearly ten years ago, Stefan inspired one of our most iconic builds, the Lamborghini Aventador–themed Thunderbike OUTERLIMIT. Now, the story continues with a new interpretation of power, precision and style.

The inspiration for the GP-Weissach project comes directly from Stefan’s Porsche 911 GT3 RS (992.1), a machine that represents the ultimate track-focused driving experience. Its 4.0-liter naturally aspirated engine delivers 525 hp, accelerating the 1450 kg car from 0 to 100 km/h in just 3.2 seconds. The Weissach Package further enhances performance by reducing weight by around 15 kilograms through targeted lightweight construction.

Visible high-gloss carbon components such as the front hood, roof, exterior mirrors and wing elements emphasize the motorsport character. Inside, the combination of Race-Tex upholstery, red contrast stitching, magnesium shift paddles and carbon fiber surfaces reflects a pure racing atmosphere. Even the magnesium wheels finished in Pyrored inspired the key color accents of our motorcycle.

For the bike, we selected the Harley-Davidson Breakout FXBRS with Milwaukee-Eight engine as the foundation. This model offers the ideal frame geometry to integrate our GP rear conversion and the substantial 9×21-inch rear wheel. The cockpit retains the original digital speedometer but is now seamlessly integrated into a custom-milled triple clamp. The goal was not to copy the Porsche, but to interpret its attitude. Colors, proportions, finishes and materials were chosen to translate the GT3 RS design language into a new aesthetic expression on two wheels.

The GP-Weissach incorporates the latest developments from our high-end GP component line. It features aerodynamically optimized triple clamps, redesigned handlebar mounts with Rebuffini RR90 controls, and a new GP front mask, all contributing to a dynamic and athletic stance. The open primary drive adds mechanical transparency and highlights the powertrain.

The single-sided swingarm, milled from a solid block of aluminum, allows an unobstructed view of the wheel. An air suspension system at the front and a hydraulically adjustable rear setup lower the bike when parked, giving it a dramatic, grounded presence.

A defining aspect of the design is the use of Pyrored accents, directly referencing the Porsche’s wheel color. The wheels of the GP-Weissach are milled from a single piece, then selectively machined after anodizing to create depth, sharp edges and visual motion. Their five-spoke Y-design appears lightweight and technical, perfectly matching the sporty and high-end character of the build. The exposed 21-inch rear wheel, combined with the perimeter brake system, serves as both a functional and visual centerpiece that underscores the precision and craftsmanship of the motorcycle.

At the end of the project, Stefan summed up his feelings in one sentence: “My goal was 100%. You delivered 110%.” For us, that is the greatest recognition. The GP-Weissach is more than a custom motorcycle. It is the translation of supercar performance philosophy into hand-built motorcycle culture. A Porsche created for the racetrack, and a Harley reinvented to share its spirit. Two machines, one shared heartbeat of motorsport passion.

La entrada Harley GP-Weissach: Born from the Porsche GT3 RS aparece primero en DARK KUSTOM.

• Owner Stephan
• Construction Year 2016
• Engine Harley-Davidson Twin Cam 2016
• Transmission 6-Speed
• Primary NH Power
• Power 140 PS / 190 NM
• Carburator Screamin‘ Eagle EFI
• Air Cleaner Rebuffini
• Ignition Harley-Davidson
• Manifold / Muffler Thunderbike
• Frame Thunderbike Dragster
• Steering Head Tilt 36°
• Swingarm Thunderbike RS Singleside
• Suspension Thunderbike Air Ride
• Handlebar Thunderbike
• Grips Thunderbike
• Clutch and Brake Master Cylinders Thunderbike
• Forward Control Kit Thunderbike
• Fuel Tank Thunderbike
• Fenders Thunderbike
• Elektric OEM Harley-Davidson
• Headlamp Thunderbike
• Seat Thunderbike
• Front End Thunderbike 1.5° Rake
• Front Rim Thunderbike Monoblock 4.0×23
• Front Wheel Avon 130/60-23
• Front Brake Caliper Thunderbike
• Front Brake Disc Thunderbike 340mm
• Rear Rim Thunderbike Monoblock 9.0×21
• Rear Wheel Metzeler 260/35-21
• Rear Brake Caliper Nissin Perimeter 6-Piston
• Rear Brake Disc Thunderbike Perimeter 21“

La entrada Screamin ‘Eagle engine OuterLimit by Thunderbike aparece primero en DARK KUSTOM.

The team at Thunderbike has once again unleashed their creativity on a Harley-Davidson Softail Fat Boy, delivering a build that is nothing short of a royal masterpiece.

The customer wanted something truly special, and Thunderbike delivered — dressing this beast in a bold and majestic Royal Purple finish.

Purple, long associated with royalty and nobility, is no coincidence here. This bike made its debut at the Custombike Show in Bad Salzuflen and instantly captivated everyone in the room. Now, it’s forever immortalized under the name Royal Purple.

The true highlight of this build lies in its wheels, crafted using a newly developed manufacturing technique. They resemble Thunderbike’s 25th Anniversary design — monoblock wheels milled from solid aluminum — but with a twist. These aren’t just classic two-tone finishes; their surfaces shimmer in a full spectrum of colors, especially impressive on the 9-inch wide, 21-inch rear wheel.

This build is a testament to what happens when engineering and artistry collide. Here’s a glimpse at some of the premium parts and upgrades included:

• Thunderbike Single-Side Swingarm Kit 21′′ Alu
• Thunderbike Pulley Anniversary Single Side
• Thunderbike Brake Disc Streetmaster
• Thunderbike Brake Caliper Adapter 300->340mm, left black
• Thunderbike Seat Plate
• Thunderbike Reflector Inside Plate
• Thunderbike Custom Alu Tank (15 ltr., stretched)
• Thunderbike Hydraulic clutch Conversion Kit chrome
• Thunderbike Grips Base Satin black cut
• Thunderbike Ignition Coil Relocation Kit black
• Thunderbike EFI Cover black wrinkle
• Thunderbike Tele Fork Lowering Kit
• Harley-Davidson Cover Battery Right, Gloss Black
• Harley-Davidson Empire Rider Footboard Kit chrome
• Harley-Davidson Empire Large Rear Brake Pedal Pad chrome
• Harley-Davidson Empire Passenger Footpegs chrome
• Harley-Davidson Empire Shifter Peg chrome
• Harley-Davidson Hand Control Lever Kit chrome
• Harley-Davidson Clutch Bracket and Master Cylinder Reservior Kit chrome
• Harley-Davidson Clutch Bracket and Master Cylinder Reservoir Kit chrome
• Harley-Davidson Switch Housing Kit, chrome
• Harley-Davidson Switch Cap Kit chrome
• Thunderbike Chin Fairing GP Style Long
• Harley-Davidson Willie G Skull Derby Cover
• Harley-Davidson Timer Cover Willie G. Skull
• Arlen Ness Big Sucker Oval Upgrade Air Filter Element
• Thunderbike Front Fender 23′′ Fiberglass
• Harley-Davidson Lower Fork Sliders chrome
• Harley-Davidson Switch Housing Kit, chrome
• Thunderbike 25th Anniversary wheel
• Thunderbike Rear Fender Steel 260 mm
• Thunderbike License Plate Frame Inside Plate
• Thunderbike License Plate Lighting
• Thunderbike Handlebar Hollywood Light
• Thunderbike Flat Riser Kit 2′′
• Thunderbike Toppers Base
• Thunderbike Front Axle Cover-Set
• Thunderbike Turn Signals Stripe LED with Housing

La entrada Harley-Davidson Softail Fat Boy – Royal Purple by Thunderbike aparece primero en DARK KUSTOM.

Fat Boy parts

• Thunderbike rear fender steel 260 mm
• Thunderbike seat shell
• Müller Motorcycle AG Müller MP1 lowering 0 – 35 mm
• Metzeler Cruisetec rear tire 260/40VR18 M/C TL 84V
• Metzeler Cruisetec front tire 160/60R18 M/C TL 70V
• Thunderbike handlebar Atlas Wide 35cm black matt
• Thunderbike riser kit Atlas 32mm black matt
• Thunderbike hydraulic clutch conversion kit black
• Thunderbike grips base satin black cut
• Thunderbike toppers base
• Thunderbike indicator stripe LED in aluminum housing
• Thunderbike side license plate holder Medium Pro black matt
• Thunderbike license plate holder inside plate
• Thunderbike license plate lighting
• Thunderbike reflector inside plate
• Thunderbike front fender GFK
• Thunderbike front spoiler GP Style Long
• Thunderbike footrest forward kit black
• Thunderbike driver footrest base satin Design
• Thunderbike gearshift & brake peg satin
• Thunderbike pillion footrest satin design
• Motogadget mo.view race mirror left
• Motogadget mo.view race mirror right
• Thunderbike pillion seat pad large without cover
• Thunderbike pulley brake system
• Thunderbike airbox cover oval torque TB logo
• Thunderbike ignition cover new custom
• Thunderbike clutch cover torque logo
• Thunderbike axle cover set rear
• Thunderbike axle cover set front
• Thunderbike axle cover swing arm left
• Thunderbike fork end caps top black matt

La entrada Harley-Davidson Softail Fat Boy ‘Dark Inferno’ by Thunderbike aparece primero en DARK KUSTOM.

Custom parts

• Thunderbike Vegas Cut wheel
• Thunderbike Pulley Vegas polished
• Thunderbike Pulley brake system
• Thunderbike brake disc Floated Vegas 340mm
• Thunderbike brake disc Floated Vegas 292mm
• Thunderbike brake calliper adapter 300->340mm left black
• Thunderbike brake calliper adapter Radial 300/340mm left
• Brembo M4 Radial brake calliper front left 108mm black
• Thunderbike rear fender GP-Style 260 mm
• Thunderbike side license plate holder Medium Pro black
• Thunderbike license plate holder Inside Plate
• Thunderbike license plate lighting
• Thunderbike reflector Inside Plate
• Thunderbike custom aluminum tank GP-Style
• Thunderbike tank mount black
• Thunderbike front spoiler GP Style Long
• Thunderbike front fender steel 21”
• Thunderbike triple clamp Grand Prix bicolor
• Thunderbike clip-on handlebar set Grand Prix bicolor
• Thunderbike headlamp cap aluminum raw
• Thunderbike indicator stripe LED in Aluminum housing
• Thunderbike footrest pre-installation kit black
• Thunderbike assembly kit pre-installation kit
• Thunderbike driver footrest V-Tech Design
• Thunderbike shift peg & brake peg satin
• Thunderbike grips base satin black cut
• Motogadget mo.view race mirror left
• Motogadget mo.view race mirror right
• Thunderbike toppers base
• Thunderbike clutch cover TB-S contrast cut
• Thunderbike timing belt guard black
• Thunderbike ignition cover TB-S contrast cut
• Thunderbike axle cover set rear
• Thunderbike axle cover set front
• Thunderbike axle cover swing arm left
• Thunderbike EFI cover with pressure gauge holder black wrinkle

La entrada Harley-Davidson Softail Breakout ‘Razor 6.0’ customized by Thunderbike aparece primero en DARK KUSTOM.

The design of Thanos reflects the masculine, unmistakable power of the Marvel character.

The gold and purple color scheme pays direct homage to the iconic Infinity Gauntlet, giving the Fat Boy an enthralling presence. The massive Grand Prix monoblock wheels emphasize strength and precision, while the purple-stitched leather seat perfectly fulfills Jörg’s vision of powerful elegance—a bike that, like the superhero himself, stands above all.

A standout feature is the dual air suspension system, incorporating both the front fork and rear swingarm, allowing the bike to achieve an impressive low stance when parked. This technical refinement evokes the moment when Thanos unleashes his full power. Additionally, the radially mounted dual disc brake system and black engine components create a flawless combination of technical performance and unmistakable style.

Parts & Details

• Thunderbike Grand Prix Rear Wheel 9.0×21
• Thunderbike Grand Prix Front Wheel 4.0×23
• Metzeler Cruisetec Rear Tire 260/35VR21 83V
• Thunderbike Brake Disc Streetmaster
• Thunderbike Rear Fender Steel 260 mm
• Thunderbike License Plate Holder Inside Plate
• Thunderbike License Plate Lighting
• Thunderbike Reflector Inside Plate
• Thunderbike Pulley Grand Prix
• Thunderbike Atlas Wide Handlebar 35cm black
• Thunderbike Atlas Riser Kit 32mm black
• Thunderbike Base Grips Satin black cut
• Thunderbike Base Toppers
• Motogadget mo.view Sport 150 Mirror black
• Thunderbike Forward Control Kit black
• Thunderbike Mounting Kit for Forward Controls
• Thunderbike Single-Sided Swingarm Conversion Kit 21” Aluminum
• Thunderbike GP Style Long Bellypan
• Thunderbike Fork Tube Kit Dual Flange black
• Thunderbike Brake Conversion Kit Radial
• Brembo Radial Monoblock M4 Caliper Set black
• Thunderbike Rider Foot Pegs Base Satin Design
• Thunderbike Front Fender 23” Fiberglass
• Thunderbike Shift Peg & Brake Peg Satin
• Thunderbike Stripe LED Turn Signals in Aluminum Housing
• Thunderbike Airbox Base Plate Oval matte black
• Thunderbike Side Stand Shortened 155mm
• Thunderbike Seat Base
• Thunderbike Foam Core for TB Seat Base
• Thunderbike Oval Torque Airbox Cover with TB Logo
• Thunderbike Ignition Cover Torque
• Thunderbike Torque Ignition Cover with Logo
• Thunderbike Torque Clutch Cover with Logo
• Thunderbike EFI Cover black wrinkle
• Thunderbike Front Axle Cover Set
• Thunderbike Left Swingarm Axle Cover
• Thunderbike Right Swingarm Axle Cover

La entrada Harley-Davidson Softail Fat Boy 114 ‘Thanos’ by Thunderbike aparece primero en DARK KUSTOM.

Introducing the Harley-Davidson Softail Breakout ‘GP-Z’ by Thunderbike

Hailing from Germany, the Harley-Davidson Softail Breakout ‘GP-Z’ is a stunning addition to Thunderbike’s GP Series. This custom build showcases a jaw-dropping design with striking golden wheels that steal the spotlight. With its sleek lines and attention to detail, the ‘GP-Z’ embodies Thunderbike’s mastery of blending luxury and power in a motorcycle.

Prepare to be amazed by this incredible creation. Stay tuned for all the specs and details at the end of the post!

La entrada Harley-Davidson Softail Breakout ‘GP-Z’ by Thunderbike aparece primero en DARK KUSTOM.