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.

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.

Jonathan Motorcars presents an exceptionally crafted 1965 Backdraft Racing Cobra RT4B, finished in a striking Blaze Orange exterior with bold black racing stripes.

This RT4B stands out not only for its aggressive presence but also for its meticulous build quality and modern performance enhancements.

With only 78 miles, this Cobra is practically brand new. Under the hood, it is powered by a Roush 427 R engine—an iconic, high-performance V8 known for its explosive torque and unmistakable sound. Paired with a Tremec TKX 5-speed manual transmission, the car offers a pure, driver-focused experience that blends classic muscle car spirit with contemporary drivability.

Inside, the Cobra features a black interior with orange stitching, perfectly matching the exterior and enhancing the car’s cohesive, motorsport-inspired design. Details such as the modern gauges, supportive bucket seats, and thoughtful ergonomics highlight the craftsmanship typical of Backdraft Racing’s RT4B series.

Side pipes, wide performance tires, and the signature long-nose Cobra silhouette complete the look of this modernized classic. This RT4B is a rare opportunity for collectors and enthusiasts seeking a high-performance roadster that combines vintage style with modern engineering.

La entrada Backdraft Racing Cobra RT4B by Jonathan Motorcars aparece primero en DARK KUSTOM.

La entrada Harley Davidson V-Rod ‘V Stealth’ by DreaMachine 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.

TT Custom Choppers from Turkey has crafted an absolute showstopper with this modified Harley-Davidson Night Rod.

This build commands attention with its 300 rear kit, air suspension system, and bold carbon fiber details.

Adding to its striking presence, the bike features orange accent lines running across the entire body, giving it a sharp and aggressive contrast against the dark base.

The finishing touch? An eye-catching custom exhaust system that not only looks spectacular but also delivers a raw, powerful sound worthy of the Night Rod’s character.

The wide rear tire enhances the muscular stance, while the air suspension ensures both comfort and that sleek, lowered profile when parked. Every detail — from the carbon touches to the fiery orange lines — shows the precision and vision of TT Custom Choppers.

This is not just a motorcycle; it’s a statement on two wheels, designed for those who want to ride something truly unforgettable.

La entrada Night Rod by TT Custom Choppers – A Turkish Masterpiece aparece primero en DARK KUSTOM.

This bold and aggressive Harley-Davidson Night Rod is a true statement piece, expertly modified by the German workshop Bad Boy Customs.

Known for their radical designs and impeccable attention to detail, BBC has once again delivered a machine that turns heads wherever it goes.

The most eye-catching feature of this custom build is undoubtedly the massive 300mm rear tire, giving the bike a muscular stance and unmatched road presence.

Complementing the powerful rear end is the distinctive BBC exhaust system, with dual black pipes perfectly integrated into the overall design.

Finished in a striking metallic orange paint with black accents and contrast-stitched custom seat, this Night Rod combines high performance with bold aesthetics. Every angle of this motorcycle showcases precision craftsmanship and a passion for custom culture.

La entrada Radical Night Rod: The Ultimate Custom by Bad Boy Customs aparece primero en DARK KUSTOM.

BOX39 has once again pushed the boundaries of motorcycle customization with their stunning Piombo Edition of the Ducati X-Diavel.

This beast features an aggressive stance, a bold orange and black color scheme, and high-end custom details that redefine the essence of performance and style.

From the sculpted fuel tank to the unique single-sided swingarm and the futuristic CNC-machined wheels, every element of this X-Diavel exudes raw power and precision craftsmanship.

La entrada Ducati X-Diavel ‘Piombo-X’ designed by BOX39 aparece primero en DARK KUSTOM.

La entrada Harley-Davidson VRod ‘Defcon’ by DD Design aparece primero en DARK KUSTOM.

Rick’s Motorcycles’ 300 Fat Boy exemplifies the brand’s craftsmanship, as the already wide Softail has been upgraded with a 300 tire and fitted with numerous high-quality custom parts from the workshop in Baden-Baden.

Staying true to the motto “something of everything” and “only the best,” the result is a stunning custom bike that undeniably represents the signature style of Rick’s. Characterized by perfection down to the smallest details, balanced lines, and meticulously engineered technical solutions, Rick’s creations stand out in the custom motorcycle world.

Chassis & Wheels

• Custom swingarm kit designed by Rick’s for perfect tire alignment
• 300mm rear tire conversion with a centered fit for optimal rideability
• Custom 3-piece “Freestyle” wheels by Rick’s:
  • Rear: 10.5 x 18 inches
  • Front: 4.5 x 18 inches
• Handmade steel rear fender with integrated frame tube cover
• Custom front fender by Rick’s

Engine & Performance

• KessTech adjustable exhaust system for enhanced sound
• Rick’s “Spoke” air filter for improved airflow
• Custom ECU mapping using a Dynojet test bench

Bodywork & Aesthetics

• Extended and reshaped fuel tank for a streamlined look
• Custom seat integration for a seamless design

Controls & Accessories

• Rick’s custom grips
• Rick’s adjustable brake and clutch levers
• Custom small flat bar handlebar mounted on Rick’s risers
• Rick’s forward foot controls for an optimal riding position

Lighting & Electrical

• Kellermann ECE-approved mini indicators for front and rear
• Integrated rear light and brake light into a compact housing

La entrada Milwaukee-Eight Softail ‘Flake King 300’ by Rick’s Motorcycles aparece primero en DARK KUSTOM.

La entrada Ducati Diavel ‘Special’ by Doctors Brush aparece primero en DARK KUSTOM.

In a world where futuristic design meets raw power, this stunning custom motorcycle stands as a masterpiece of engineering and aesthetics.

With its sleek black finish, aerodynamic bodywork, and aggressive stance, it looks like it just emerged from a cyberpunk universe. The glowing orange accents add a touch of high-tech sophistication, while the massive rear tire and streamlined front fairing hint at extreme speed and performance. This machine isn’t just a ride—it’s a statement of innovation and boldness.

La entrada Custombike racing ‘McLaren Motorcycles’ by AI Designs aparece primero en DARK KUSTOM.

Technical Specifications

Features & Highlights

Aerodynamics

• Bündnerbike Tank 3D
• Bündnerbike Rear Fender 3D with LED
• Bündnerbike Seat Plate with Diamond Rising Stitching

Special Accessories

• Harley-Davidson Adversary Handlebar Grips
• Harley-Davidson Adversary Rider Footboards
• Harley-Davidson Adversary Timer Cover
• Harley-Davidson Derby Cover
• Bündnerbike Drag Bar Handlebar
• Bündnerbike Flush-Mount, Keyless Fuel Cap
• Bündnerbike License Plate with Illumination

Sound Syste

Fully Legal

The exhaust system by Jekill & Mr. Hyde features an electronic sound control system. This ensures that the exhaust not only delivers an impressive acoustic experience but is also fully compliant with legal standards.

Paintwork & Coating

The paintwork features an intricate copper base coat with an orange hue, giving the Tucan a unique presence. Carefully applied black accents and lettering create an appealing contrast, drawing attention to specific details and adding a bold character to the bike. Precisely designed stripes contribute to the exclusivity of the paintwork by enhancing the visual dynamics and emphasizing the overall aesthetic of the Tucan.

This paintwork has been executed with the utmost craftsmanship and attention to detail, ensuring the bike is not only a means of transportation but also an artistic masterpiece. The copper base, black accents, and carefully positioned stripes combine into a harmonious composition, making the Tucan a true eye-catcher.

Wheels & Suspension

Bündnerbike Air Suspension

The tested pneumatic air suspension allows seamless adjustment of both the vehicle’s height and suspension properties, ensuring maximum adaptability.

Wheels

• Precision-machined Lakester cast aluminum wheels

Front Fork

• 49-mm telescopic fork with dual-rate springs, lightweight aluminum triple clamps, and “Beer Can” covers

Braking System

• Harley-Davidson brakes: Four-piston fixed calipers in the front and two-piston floating calipers in the rear
• Harley-Davidson brake discs: Floating single disc with Split 7 Spokes in both front and rear

La entrada Cruiser Fat Boy 114 ‘Tucan’ by Bündnerbike aparece primero en DARK KUSTOM.

La entrada Custombike custombike ‘Racing’ generated by AI aparece primero en DARK KUSTOM.

La entrada Custombike motorcycle ‘Big Monster’ generated by AI aparece primero en DARK KUSTOM.