The New Rough Crafts Silhouette R Ducati

The Rough Crafts Silhouette R stands as a compelling testament to the art of bespoke motorcycle transformation. Conceived and meticulously executed by the renowned Taiwanese custom builder, Winston Yeh, this motorcycle is a profound reimagining of a 2023 Ducati Monster 937. It embodies a unique philosophy that seamlessly integrates the timeless allure of classic design with the raw aggression of cutting-edge racing technology. Winston Yeh himself encapsulates this creation as “the shadow of speed—shaped by intent, sharpened by engineering, and finished with restraint,” a description that perfectly captures its potent yet understated presence.¹

Winston Yeh’s design approach is consistently characterized by a commitment to “dark aesthetics, race-ready components, and a hyper-considered silhouette”.¹ His workshop, Rough Crafts, has garnered international acclaim for consistently delivering designs that boast a “factory level fit and finish”.³ This meticulous quality is achieved through a discerning selection of “ultra-high-end components and running gear,” often incorporating a substantial amount of carbon fiber.³

The genesis of the Silhouette R project stemmed from a client’s specific desire for “something performance-based and super cool”.¹ This open-ended commission granted Yeh the creative freedom to transcend conventional boundaries, even when working with a modern, inherently compact donor bike like the Monster 937.² The resulting motorcycle transcends typical custom archetypes, elevating a production Ducati into a dynamic work of art that is “more than just a looker — it’s made to move”.²

The Foundation: Unpacking the 2023 Ducati Monster 937

The 2023 Ducati Monster 937 served as the original platform for the Silhouette R, a model celebrated as a “sporty naked bike that maintains the classic and timeless style captured on paper by Miguel Ángel Galuzzi back in 1991”. Its inherent appeal lies in its harmonious blend of a “characterful engine with a lightweight and highly capable chassis” .

From the factory, the Monster 937 is powered by a 937cc Testastretta 11° liquid-cooled L-twin engine, delivering a robust 111 horsepower at 9,250 rpm and 93 Nm (69 lb-ft) of torque at 6,500 rpm.² This engine platform is a versatile and proven powerplant, widely utilized across various models within the Ducati lineup.⁵ The stock chassis features an aluminum front subframe and swingarm, a design choice directly inspired by the Panigale V4 frames, where the engine itself functions as a load-bearing element, contributing to a lightweight structure . Standard suspension components include a Ø 43 mm inverted fork at the front and a progressive linkage monoshock with an aluminum double-sided swingarm at the rear.⁵ The braking system comprises front and rear Brembo calipers, with dual 320mm semi-floating discs at the front, complemented by advanced electronic aids such as Cornering ABS, Traction Control, and Wheelie Control.⁴ The motorcycle originally rolled on Pirelli Diablo Rosso III tires, sized 120/70 ZR17 at the front and 180/55 ZR17 at the rear.⁴

Despite the Monster 937’s factory prowess in agile handling and its advanced technological features ¹, Winston Yeh’s fundamental belief is that “everything can be improved” . The impetus for this specific project was a client’s desire for “something performance-based and super cool,” a commission that provided Yeh the creative latitude to innovate without being constrained by prevailing trends.¹ This drive to transform a capable production machine into a unique creation highlights a core aspect of high-end custom building. It demonstrates that the pursuit of enhancement extends beyond mere numerical performance gains; it encompasses an artistic imperative to imbue the motorcycle with a distinct aesthetic, a tailored ergonomic fit, and an expression of profound individuality. The willingness to allow “costs and versatility take a backseat” underscores that the true value of such a project lies in its bespoke, irreplicable nature, transforming a mass-produced item into a dynamic work of art.²

Yeh’s decision to utilize the base-spec Monster 937 (pre-SP release) was a strategic choice. While Ducati’s higher-spec models, such as the Monster SP or the formidable Streetfighter V4, offer greater raw power and advanced features, Yeh observed that these bikes are often “packed super tight and leaves very little room for customization”.² The inherent complexity and integrated nature of these top-tier OEM machines can limit the scope for radical artistic and engineering intervention. In contrast, the 937’s L-twin engine, despite being less powerful than the V4, offered a “much better platform for any custom build” due to its inherent simplicity and greater modifiability.⁶ This choice reveals a critical consideration in modern high-end custom motorcycle building.

As OEM motorcycles become increasingly sophisticated and optimized from the factory, they present fewer opportunities for significant re-imagining. A master builder like Yeh prioritizes the potential for extensive modification and unconstrained artistic freedom over simply starting with the absolute highest factory specification. The most suitable donor bike for a truly bespoke build is often not the most powerful or feature-laden, but rather the one that provides the most malleable canvas for a comprehensive transformation. This approach underscores the builder’s expertise in identifying a platform’s inherent adaptability.

Engineering Excellence: Performance-Driven Modifications

The Rough Crafts Silhouette R is a masterclass in performance enhancement, meticulously upgrading key systems to elevate the riding experience without compromising the core character of the Ducati Monster.

Power & Presence: Exhaust and Intake System

The stock exhaust system of the Monster 937 was entirely replaced with an “impressive handcrafted two-into-one exhaust system” . This bespoke setup features an SC Project S1GP muffler paired with a titanium manifold meticulously designed by Rough Crafts and “executed by Zinja Handmade, with some dizzying curves”.¹ SC-Project mufflers, particularly the S1GP, are renowned for their optimal balance of “lightness, design and sound without compromise,” making them a preferred choice for racing applications.⁷ These systems offer a “huge weight reduction (until -60% if compared to original exhaust)”.⁷ SC-Project, an Italian manufacturer, leverages its extensive experience in MotoGP, Moto3, Moto2, and Superbike racing to develop products that push the boundaries of performance.⁸

The S1-GP’s conical shape and large outlet diameter are engineered to enhance exhaust airflow and produce a “strong and deep sound”.⁷ While specific power gains for the Monster 937 are not explicitly quantified, similar SC Project full systems for Ducati Panigale V4 models demonstrate significant benefits, including a 4.6 kg weight saving and increases of 15.5 hp and 13.2 Nm of torque.¹² These general improvements—enhanced exhaust flow, reduced backpressure, and improved engine efficiency—collectively contribute to superior acceleration and throttle response.¹¹

Complementing the exhaust system is a “more efficient air filter from Sprint Filter”. Upgrading to a high-performance air filter, such as those from Sprint Filter, significantly improves airflow into the engine. This leads to increased power output and optimized fuel consumption, a simple yet highly effective means of enhancing overall engine efficiency.¹⁴

A “striking transparent clutch cover from the CNC Racing catalog” is a prominent aesthetic and functional addition to the engine . This cover is crafted from a lightweight alloy, precision-machined from a solid block, and then anodized. Its transparency is achieved through a Lexan panel, chosen for its resistance to shock and high temperatures.¹⁵ Beyond its captivating visual appeal, which offers a glimpse into the engine’s intricate inner workings, it also provides essential protection for the clutch mechanism.¹⁸ CNC Racing is widely recognized for its precision engineering and Italian craftsmanship, consistently producing high-grade aluminum and carbon fiber components that are both lightweight and exceptionally strong.¹⁸

The modifications to the Silhouette R’s power and presence systems illustrate a sophisticated approach to performance enhancement that extends beyond merely rebuilding the engine’s internals. By optimizing the engine’s “breathing” through a high-performance exhaust and intake system, Rough Crafts achieves substantial gains in efficiency, power delivery, and overall responsiveness. This method of holistic tuning allows for significant improvements without compromising the donor engine’s factory reliability. Furthermore, the selection of components like the “impressive handcrafted” exhaust and “striking” transparent clutch cover demonstrates that for Rough Crafts, form and function are not separate considerations but deeply intertwined. The visual appeal of these components is as integral to the blend of “racing technology” as their technical specifications, reinforcing the design philosophy of harmonizing retro styling with modern, high-tech racing elements.

Precision & Control: Chassis and Suspension Dynamics

The chassis of the Rough Crafts Silhouette R demonstrates a selective approach to modification. Notably, the original aluminum front subframe and swingarm of the Ducati Monster 937 are retained. The front subframe, a lightweight solution, is explicitly noted as being “clearly inspired by the Panigale V4 frames,” connecting the fork directly to the engine cylinder heads and utilizing the engine as a load-bearing element . This strategic decision suggests that these stock components were already deemed of sufficiently high performance and structural integrity to meet the demanding objectives of the custom build, indicating a discerning and selective approach to modification rather than an indiscriminate overhaul of every factory part.

In stark contrast to the front, the rear end of the Monster 937 underwent a complete metamorphosis, allowing Winston Yeh to design a “memorable ‘ass'” . This involved the complete replacement of Ducati’s original one-piece plastic tail section.¹ A new, custom billet CNC subframe was precisely manufactured by Artitek Ltd., which was then paired with a “3D-printed, pert tail section”.¹ Artitek Ltd. specializes in professional CNC machining services for motorcycle parts and critically utilizes 3D printing for highly efficient prototyping and rapid iteration of design variations. This significantly reduces prototyping timelines from weeks or months to mere hours.²⁰

This synergistic application of CNC machining—for its unparalleled precision, strength, and durability in structural components like the subframe—and 3D printing—for its ability to create complex, lightweight, and aesthetically refined bodywork like the tail section—is a defining characteristic of advanced, high-end custom fabrication.²² This combination of manufacturing techniques represents a sophisticated hybrid strategy. Rough Crafts leverages the specific strengths of each technology: CNC for robust, high-precision structural elements where strength is paramount, and 3D printing for intricate, lightweight, and rapidly iterated aesthetic components. This allows for a level of design freedom and performance optimization that neither technology could achieve alone, demonstrating a cutting-edge approach to bespoke motorcycle fabrication that maximizes both structural integrity and complex aesthetic forms.

The suspension system received a significant upgrade. The front features “Ohlins FGR300 stanchions,” presented with a distinctive “dark suspension” appearance, implying a custom coating.¹ These FGR300 forks represent the pinnacle of racing suspension technology, incorporating “technical solutions and experiences from MotoGP and World Superbike”.²⁶ They are equipped with Öhlins’ TTX 25 pressurized cartridge technology, offering comprehensive adjustability for preload, rebound, and compression. This advanced design provides “improved brake support and tire feel when riding,” crucial for high-performance handling.²⁶ For the rear, an Öhlins shock absorber, “inherited from a Monster SP,” is utilized, to which a “hydraulic preload adjuster from Taiwanese specialist Andreani has been added”.¹

The Monster SP already comes equipped with Öhlins suspension as standard from the factory.⁵ Andreani Group specializes in hydraulic systems for both forks and shocks, known for delivering “exceptional performance in cornering and braking” through their adjustable compression, rebound, and preload mechanisms.³¹ This targeted upgrade strategy indicates a highly discerning and efficient approach to customization. Rather than automatically replacing every OEM part, Rough Crafts identifies existing high-performance components (even from higher-tier stock models) and meticulously enhances them where specific benefits, such as finer adjustability or a particular handling characteristic, are desired. This demonstrates an expert-level understanding of component synergy and value, allowing for a truly bespoke suspension setup tailored to the build’s specific performance goals without unnecessary expense or complexity.

Grip & Stopping Power: Wheels and Braking System

The motorcycle is equipped with “impressive 17-inch Jonich Wheels rims wrapped in sticky Pirelli Supercorsa V4 tires in 120/70 and 190/55 sizes”.¹ Jonich Wheels are a premium choice in spoked wheel technology. Their hubs are precision-machined from solid billet using 5-axis CNC, and their rims are fluo-formed from 6082-T6 alloy without welding, ensuring exceptional roundness, strength, and consistent fiber continuity.³² A key innovation is their “no nipple” design, where spokes screw directly into the hub. This design significantly reduces peripheral mass and improves wheel responsiveness.³³ While spoked wheels are often associated with off-road applications due to their flexibility and impact absorption ³⁶, their application here for high-performance street/track use highlights their benefits in reducing rotational inertia. Jonich also offers titanium spokes, further enhancing lightness and responsiveness.³⁷

Pirelli Supercorsa V4 tires represent Pirelli’s flagship Hypersport offering, meticulously engineered for peak performance on both road and racetrack.³⁸ These tires feature a dual-compound construction, providing maximum grip during cornering and powerful thrust upon exit.³⁸ Their racing profiles are directly derived from World Superbike (WSBK) competition, ensuring outstanding riding ease and reactivity.³⁸ The Supercorsa V4s are known for their rapid warm-up characteristics and consistent grip across a wide range of temperatures, making them an ideal choice for aggressive street riding and track days.³⁸

The braking system is a critical performance upgrade, featuring “Brembo calipers, the 848 radial model for the front axle, and Sicom carbon discs”.¹ Specifically, the front utilizes dual Brembo 484 four-piston radial calipers, complemented by a single Brembo HP billet caliper at the rear.² Brembo 848 radial calipers are precision-engineered monoblock units, cast from a single piece of aluminum. This construction method ensures “excellent stiffness and precision operating values”.⁴⁵ They incorporate technology directly derived from MotoGP, guaranteeing optimal structural rigidity and come equipped with high-performance sintered brake pads.⁴⁵

Sicom carbon discs are heralded as “the most advanced motorcycle brake rotors in existence”.⁵⁰ Manufactured from a “Fibre-Reinforced Densified Double Matrix Composite Material,” they offer a “high coefficient of friction for instant bite—even when wet and cold,” a distinct advantage over traditional carbon discs that require race temperatures to perform optimally.⁵⁰ Their key advantages include exceptionally low weight (typically under 700g per disc, resulting in over 2 kg of unsprung weight savings at the front), reduced gyroscopic and rotational inertia for enhanced agility, extreme rotor surface hardness for prolonged lifespan, and seamless compatibility with both OEM and aftermarket calipers.⁵²

The selection of Jonich wheels and Sicom carbon discs highlights a sophisticated understanding of motorcycle dynamics, particularly concerning unsprung weight. The extremely low weight of Sicom discs and the reduced peripheral mass of Jonich wheels directly translate to a motorcycle that “tips into corners noticeably easier” and changes direction “much faster”.⁵⁰ This reduction in unsprung and rotational inertia also contributes to “quicker acceleration and improved braking efficiency”.⁵² The impact of these modifications is so significant that the bike’s handling can feel profoundly altered, akin to a lighter class of motorcycle.⁵⁰ This demonstrates that for high-performance custom builds, marginal gains in weight reduction, especially in unsprung mass, yield disproportionately large improvements in handling, agility, and rider feedback, underscoring that performance enhancement is equally about optimizing the chassis and its interaction with the road, not solely about engine power.

The integration of components like Öhlins FGR300 forks, Brembo 848 radial calipers, and Pirelli Supercorsa V4 tires, all derived from top-tier racing series like MotoGP and World Superbike, showcases a significant trend in the high-performance motorcycle industry: the effective transfer of cutting-edge technology from competitive motorsports to consumer-level products, including bespoke custom builds. Despite their racing pedigree, these components are explicitly designed and adapted for road use. By incorporating these race-proven elements, Rough Crafts delivers a machine that offers a riding experience and performance levels previously exclusive to the track. This blurs the lines between dedicated race machines and road-legal motorcycles, illustrating how master builders can leverage technological evolution to provide unparalleled riding experiences.

Table 1: Key Performance Component Upgrades

Artistry in Detail: Ergonomics, Bodywork, and Finishing Touches

Beyond its formidable performance upgrades, the Rough Crafts Silhouette R distinguishes itself through meticulous attention to ergonomic refinement, innovative bodywork, and exquisite finishing touches, transforming the machine into a cohesive work of art.

Rider’s Domain: Ergonomics and Controls

To instill a “more racing attitude” and achieve a precisely adapted ergonomic position, a substantial investment was made in components from the CNC Racing catalog.¹ This includes “elegant clip-on handlebars” that feature an integrated display, contributing to a clean and performance-oriented cockpit.¹ CNC Racing is renowned for its precision-engineered, lightweight, and robust components that collectively enhance rider comfort, control, and overall feel.¹⁸

The handlebars are fitted with “Motogadget grips” . Motogadget mo.grips are universal aluminum grips, meticulously milled from solid billet and finished with black anodization. Their distinctive block profiling in the hand area ensures a “very good grip feel,” optimizing rider control and comfort.⁵⁶ These grips are also designed to seamlessly integrate with other Motogadget components, such as bar-end blinkers.⁵⁶

Braking and clutch actuation are elevated with “Brembo RCS CorsaCorta radial clutch and brake pumps with MotoCorse fluid reservoirs” . The Brembo RCS CorsaCorta master cylinders are a direct infusion of MotoGP experience, offering unparalleled customization. They feature an adjustable lever center (allowing settings for 18mm or 20mm fulcrum-to-piston distance) and three distinct responsiveness modes (Normal, Sport, Race) to precisely tailor the “bite point” to rider preference and riding conditions.⁶⁰

Constructed from forged aluminum, they combine maximum lightness with superior stiffness and strength, further enhanced by a hard-anodized finish for exceptional durability.⁶⁰ The MotoCorse fluid reservoirs are crafted from billet aluminum (Anticorodal) with titanium caps, precision CNC machined, and anodized in various colors. These reservoirs are ingeniously designed to attach directly to the Brembo master cylinders, creating a remarkably clean and minimalist handlebar setup by eliminating traditional hoses and clamps.⁶³

Completing the ergonomic triangle are adjustable footrests, which include toe pegs, allowing for a personalized rider fit . CNC Racing provides adjustable rearsets and footpegs, manufactured from billet aluminum, which offer superior grip, reduced weight, and significantly enhance rider comfort and control, particularly during aggressive riding.¹⁴ The seating is a bespoke “leather seat with a classic diamond pattern, designed by Chirui Leather Custom”.¹ Custom leather seats are a product of meticulous craftsmanship, involving hand-cutting, riveting, stitching, and assembly. They are typically built upon a sturdy steel or fiberglass seat pan, shaped with high-density foam to provide both comfort and durability tailored to the specific design.⁷¹

Sculpting the Silhouette: Bodywork and Paint

Winston Yeh’s approach to the Silhouette R’s bodywork departs significantly from traditional methods, with the builder himself noting that the bike “barely features any sheet metal work” . Instead, 3D printing played a pivotal role in creating some of the most notable bodywork elements. This includes the front fairing, the distinctive wings on either side of the fuel tank, and the aforementioned pert tail section, all a result of the excellent work of SFC Simon Fiber Craft.¹ The utilization of carbon fiber 3D printing offers significant advantages, including an exceptional strength-to-weight ratio, enhanced stiffness, superior dimensional stability, and high heat resistance.⁷⁸ This advanced manufacturing technique also minimizes the need for extensive post-processing, contributing to a cleaner finish.⁷⁸ These 3D-printed elements seamlessly integrate with the bike’s overall silhouette, complemented by carbon fiber side covers for the tank, sourced from the Motocomposites catalog .

The aesthetic balance of the Silhouette R is significantly elevated by the “impressive paint job done by Rover Works Custom Paint”. The scheme combines “sobriety and dynamism” through a design of white bars on lacquered carbon fiber, accented by very fine white and neon blue stripes . Custom motorcycle painting involves intricate techniques, including multiple layers of paint and clear coat, often requiring extensive wet sanding between applications to achieve a flawless finish.⁷⁹ Artists may utilize airbrushing for detailed shading and gradients, or hand-painting for solid, precise lines.⁷⁹ The ability to mix custom colors and match existing palettes ensures a truly unique and personalized result.⁸¹

The Finishing Touch

The comprehensive transformation of the Silhouette R is completed by a suite of high-quality components from various specialized suppliers. CNC Racing, an Italian manufacturer, extended its contribution beyond the transparent clutch cover to include the rear fender, the brake lever guard, and the gas tank cap . These additions reinforce CNC Racing’s reputation for precision, durability, and aesthetic enhancement across a wide range of motorcycle parts.¹⁸

Lighting is handled by Koso, a specialist in motorcycle illumination. Koso supplied the front headlight and the tiny front and rear turn signals, with the latter also serving as taillights and brake lights . Koso’s LED lighting technology is characterized by its brightness, compact design, and durable CNC-machined aluminum housings, often being DOT certified for road legality.⁸³

Finally, the “beautifully decadent badges on the tank” are the work of 2 Abnormal Sides, a frequent collaborator with Winston Yeh. 2 Abnormal Sides is known for imbuing each item with unique characteristics through meticulous hand-craftsmanship. Their work often features sterling silver as a base, complemented by other materials such as brass, 18k gold, crystal, and leather, reflecting a blend of Eastern and Western cultural influences and a rebellious hard-core biker aesthetic.⁹² The entire project was expertly assembled by the team at CH Moto, Winston Yeh’s trusted workshop.

Conclusions

The Rough Crafts Silhouette R is a profound statement in the realm of custom motorcycle design, embodying Winston Yeh’s distinctive philosophy: “It’s the shadow of speed—shaped by intent, sharpened by engineering, and finished with restraint”.¹ This transformation of a 2023 Ducati Monster 937 transcends mere modification, presenting a cohesive vision where classic elegance and cutting-edge racing technology are seamlessly interwoven.

The project demonstrates that true mastery in custom motorcycle building lies not necessarily in starting with the most powerful or feature-laden factory model, but in identifying a platform with inherent modifiability. Yeh’s strategic choice of the base-spec Monster 937, despite its lower factory output compared to a V4, underscores a preference for a malleable canvas that allows for extensive artistic and engineering intervention. This approach highlights that the pursuit of ultimate performance and bespoke artistry often prioritizes creative freedom over raw, out-of-the-box power.

Furthermore, the Silhouette R showcases a sophisticated hybrid manufacturing strategy. It expertly combines the precision, strength, and durability of CNC machining for structural components like the custom subframe with the design freedom, lightweight properties, and rapid prototyping capabilities of 3D printing for intricate bodywork elements. This synergistic application of advanced manufacturing techniques allows for a level of aesthetic complexity and performance optimization that would be challenging to achieve with traditional methods alone.

The meticulous selection of every component, from the Öhlins FGR300 forks and Brembo 848 radial calipers to the Jonich Wheels and Pirelli Supercorsa V4 tires, reflects a discerning eye for performance and a deep understanding of motorcycle dynamics. The emphasis on reducing unsprung weight and rotational inertia, coupled with the integration of race-proven technologies adapted for road use, demonstrates a holistic approach to performance enhancement. This blurs the lines between dedicated track machines and road-legal motorcycles, offering a riding experience that is both exhilarating and refined.

Ultimately, the Rough Crafts Silhouette R is more than just a custom motorcycle; it is a benchmark for what is achievable when creative vision, engineering precision, and an uncompromising commitment to quality converge. It solidifies Rough Crafts’ reputation for delivering designs with an “obsessive level” of execution and a “factory level fit and finish,” setting a new standard for blending elegance and aggression in the bespoke motorcycle world.¹

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