For high-performance Harley-Davidson builders, chassis rigidity is not an option—it is the foundation of a confident, predictable ride. When a high-torque V-Twin engine puts its power to the pavement, every component between the motor and the rear axle is subjected to immense torsional forces. The stock swing arm, often a component designed for cruising rather than aggressive performance, becomes the primary point of failure in this system. It flexes, it twists, and it compromises the very stability the rider depends on. This is where precision engineering takes over. Discover how the Mako swing arm eliminates chassis flex and transforms Harley-Davidson Touring handling through elite-level engineering.
The Mako swing arm is not an accessory; it is a structural necessity for riders who demand absolute tracking accuracy and unwavering stability from their motorcycle. Machined from a solid block of 6061-T6 billet aluminium, it represents the definitive solution to the chassis flex that plagues even the most modern Harley-Davidson Touring models.
Table of Contents
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Material Science: Why 6061-T6 Aluminium is the Optimal Choice
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Installation and Compatibility for Harley-Davidson Touring Models
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The Project Faster Philosophy: Built for Uncompromising Performance
The Mako Swing Arm: Solving the Problem of Chassis Flex
The term ‘Mako’ signifies a precision-machined billet solution engineered specifically for the modern Harley-Davidson Touring chassis (2009 and newer). Its primary function is to solve the inherent problem of ‘swing arm flex’—a phenomenon where the stock component twists laterally under the immense torque loads generated by high-performance V-Twin engines. This flex is the root cause of the infamous ‘bagger wobble’ and the vague, unsettling feeling riders experience during high-speed cornering or aggressive acceleration.
When you demand more from your machine, particularly in builds exceeding 120+ horsepower and high-torque applications, the stock stamped or cast swing arm simply cannot maintain its structural integrity. This lateral movement in the rear end directly compromises cornering confidence, disrupts tyre tracking, and introduces a dangerous element of unpredictability. The Mako swing arm is engineered to be the definitive fix, creating a rock-solid link between the frame and the rear wheel that allows the suspension to function as intended without interference from chassis distortion.
Understanding Lateral Torsion in V-Twin Frames
The long, heavy chassis of a Harley-Davidson Touring model acts as a massive lever, amplifying the forces exerted on the swing arm pivot. Under heavy acceleration, the drive belt pulls the rear wheel forward on one side, creating a powerful twisting motion—or lateral torsion—on the swing arm. A stock cast or stamped steel arm, designed with different priorities, will physically twist under this load. This minute distortion has significant consequences:
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Compromised Handling: The most immediate symptom is a feeling of instability, often described as a rear-end ‘wobble’ or ‘squirm,’ particularly in long, high-speed sweeping corners. The rear wheel is no longer perfectly aligned with the front, forcing the rider to make constant, unnerving corrections.
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Poor Belt Alignment: Persistent flex can lead to inconsistent belt tension and alignment, causing premature wear on the belt and pulleys. In extreme cases, it can even lead to belt failure.
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Accelerated Bearing Wear: The twisting force places undue stress on the swing arm pivot bearings and wheel bearings, leading to a shorter service life and the potential for mechanical failure.
The Mako swing arm’s billet construction and engineered geometry create a structure that is fundamentally more resistant to these torsional forces, ensuring your rear wheel stays exactly where it needs to be, no matter how much power you put down.
Billet Machining vs. Cast Construction
The difference in performance between the Mako and a stock swing arm begins at the molecular level. The method of manufacturing dictates the component's ultimate strength and reliability.
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Cast Components: Stock swing arms are typically made by pouring molten metal into a mould. This process can introduce inconsistencies, air pockets, and a non-uniform grain structure. The resulting part is weaker and more prone to flexing or cracking under high stress.
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Billet Components: The Mako is CNC machined from a single, solid block of 6061-T6 aluminium. This raw material, known as billet, has a continuous and aligned grain structure, making it incredibly dense and uniformly strong. There are no voids, no weak points, and no internal stresses from a cooling process.
This method allows for the creation of a part with exceptional strength and rigidity. Furthermore, CNC machining enables the holding of extremely tight tolerances, down to thousandths of an inch. This precision eliminates the slop and play often found in the axle and pivot points of mass-produced cast parts, contributing to a more connected and responsive feel for the rider.
Material Science: Why 6061-T6 Aluminium is the Optimal Choice
The heart of the Mako swing arm is its material: 6061-T6 aircraft-grade aluminium. While other alloys exist, 6061-T6 was deliberately chosen for its ideal combination of strength, durability, and corrosion resistance, making it the superior engineering choice for a high-stress chassis component exposed to the harsh realities of the road.
The ‘T6’ designation is critical. It refers to a specific two-stage tempering process where the aluminium is solution heat-treated and then artificially aged. This process significantly increases the material's tensile strength and hardness far beyond its natural state. The result is a material that provides an exceptional strength-to-weight ratio, allowing for the construction of a swing arm that is immensely rigid yet significantly lighter than its steel counterpart. This justifies the investment in a premium material by delivering tangible performance benefits that simply cannot be achieved with lesser alloys or manufacturing methods.
6061 vs. 7075: The Engineering Trade-Off for a Superior Chassis
In the world of high-performance metals, a debate often arises between 6061 and 7075 aluminium. While 7075 boasts a higher ultimate tensile strength on paper, it is not automatically the better choice for every application. For a motorcycle swing arm, 6061-T6 represents a more intelligent and durable engineering decision.
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Strength vs. Ductility: 7075 aluminium, while harder, is also more brittle. It has lower fracture toughness, meaning it is more susceptible to cracking under the repeated, high-frequency stress cycles a swing arm endures. 6061-T6, by contrast, offers greater ductility. It can withstand more flexing and vibration without fatiguing, making it a safer and more reliable choice for long-term chassis integrity.
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Corrosion Resistance: A swing arm lives in a hostile environment, constantly bombarded by water, road salt, and debris. 6061 exhibits significantly superior corrosion resistance compared to 7075, which is highly susceptible to stress corrosion cracking, especially around fasteners and pivot points. The Mako's 6061 construction ensures that its structural integrity is not compromised by the elements.
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Machinability: The complex, webbed design of the Mako, which gives it incredible strength with minimal weight, is easier to achieve with the excellent machinability of 6061. This allows our engineers to design a component optimized for performance without compromising on manufacturing precision.
In short, Project Faster chose 6061-T6 not as a compromise, but as the optimal material for the application—one that balances immense strength with the real-world demands of durability, safety, and longevity.
Weight Savings and Unsprung Mass
One of the most profound benefits of upgrading to the Mako swing arm is the reduction of unsprung weight. ‘Unsprung weight’ refers to the mass of all components that are not supported by the suspension system—this includes the wheels, tyres, brake components, and the swing arm itself.
Reducing unsprung weight is critical for high-performance handling. A lighter swing arm allows the suspension and shocks to react more quickly and efficiently to road imperfections. The rear wheel can track the pavement more accurately, maintaining better traction and providing a smoother, more controlled ride. By shedding several pounds from the rear end compared to the stock steel unit, the Mako swing arm delivers a noticeable improvement in handling dynamics, allowing the shocks to do their job without having to manage excess inertia. This translates to a bike that feels more agile, more planted, and more responsive to rider input.
The Mako Advantage: Precision Machined Features
Beyond its superior material and construction, the Mako swing arm incorporates features designed to meet the demands of the most discerning performance builders. Every aspect of its design is a direct response to the shortcomings of the factory setup, providing tangible benefits in alignment, braking, and durability.
The 'No Flex' geometry is the core of the design, engineered with internal webbing and a cross-section that provides maximum resistance to lateral torsion during high-torque launches and aggressive cornering. To protect this engineering, the Mako is available in durable finish options, including a hard anodized black, that resist road salt, chemical exposure, and environmental corrosion, ensuring the component looks as good as it performs for years to come.
Integrated Axle Adjusters and Alignment
Proper wheel alignment and belt tension are non-negotiable for performance and safety. The Mako swing arm features a high-precision, integrated axle adjustment system that is a significant upgrade over the stock setup.
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Simplified Adjustments: The system is designed for ease of use and accuracy, allowing for precise and repeatable adjustments of belt tension and rear wheel alignment.
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Zero-Play Design: The precision-machined adjusters eliminate the ‘play’ or slop found in factory components, ensuring that once the axle is set, it stays put. This is critical for maintaining a perfectly straight track under power.
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Enhanced Durability: The robust design of the adjusters is built to withstand the high clamping forces required for performance applications, preventing the axle slippage that can occur with stock hardware.
Radial Brake Integration
Stopping power is just as important as horsepower. The Mako swing arm is engineered to be the ideal foundation for a modern, high-performance braking system. It is designed for seamless compatibility with high-performance 108mm radial mount brake arms, such as the PF Vector 108mm Radial Mount Brake Arm.
The benefit of this integration is twofold. First, the immense rigidity of the Mako provides a solid, flex-free mounting point for the brake caliper. This translates to a firmer, more responsive lever feel and more consistent braking power. Second, it enables riders to upgrade to powerful, multi-piston radial calipers, which offer superior stopping force and heat dissipation compared to the stock axial-mount caliper. For a complete rear-end overhaul, organizing your build to include both the Mako swing arm and a radial brake setup is the ultimate path to performance.
Installation and Compatibility for Harley-Davidson Touring Models
The Mako swing arm is a direct bolt-on upgrade engineered for 2009 and newer Harley-Davidson Touring models. It is designed to integrate seamlessly with your motorcycle's chassis, utilizing the factory pivot geometry for a straightforward swap. This means no custom frame modifications are required, allowing for a professional installation with standard tools.
While the installation is direct, the importance of using high-quality fasteners cannot be overstated. Pairing the Mako with a superior fastener solution, such as a titanium bolt kit, ensures that every component in the system meets the same high standard of performance and strength. A single sentence to remember: the Mako utilizes factory pivot geometry for a seamless swap, but its performance is best realized with hardware that matches its quality.
Hardware Matters: Titanium Bolt Kits
In a high-performance system, you are only as strong as your weakest link. Stock steel bolts can stretch and corrode, compromising the integrity of the connection between the frame and the swing arm. Upgrading to a titanium hardware kit offers several distinct advantages:
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Superior Strength: Aerospace-grade titanium bolts have a higher tensile strength than most steel fasteners, providing greater clamping force and resistance to stretching under load.
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Weight Savings: Titanium is approximately 45% lighter than steel, contributing to the overall goal of reducing weight for improved handling and suspension performance.
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Corrosion Proof: Titanium is impervious to rust and corrosion, ensuring the longevity and reliability of your assembly, even in harsh weather conditions.
Pairing the Mako swing arm with Project Faster titanium hardware is the professional-grade approach to ensure maximum rigidity, safety, and durability.
Professional Setup and Torque Specs
A component of this calibre demands a professional installation. A factory service manual and a calibrated torque wrench are non-negotiable tools for this job. Adhering to the correct torque specifications for the swing arm pivot bolt, axle nut, and all other fasteners is critical for both safety and performance.
During installation, it is also essential to check for proper clearance with aftermarket components, particularly large-volume exhaust systems like the PF Liberator. Finally, installing high-quality, fresh bearings in the pivot assembly is a mandatory step. This ensures smooth, bind-free movement and allows the Mako swing arm to deliver its full potential for improved handling and stability.
The Project Faster Philosophy: Built for Uncompromising Performance
At Project Faster, our commitment is to Canadian-engineered precision and durability. We build components for a specific type of rider: one who prioritizes mechanical function over cosmetic flair and who understands that true performance is born from superior engineering. The Mako swing arm is the embodiment of this philosophy. It is designed for riders who refuse to accept stock limitations and who demand a machine that performs as well as it looks.
By purchasing directly from a manufacturer that lives and breathes V-Twin physics, you are not just buying a part; you are investing in a performance solution backed by real-world testing and an unwavering commitment to quality. We invite you to join the elite group of riders who understand that a stable chassis is the key to unlocking their bike’s true potential.
Engineering Faster Hardware
Behind every component we design is a rigorous process of testing and refinement. Real-world data from high-horsepower builds informs every CNC toolpath and every design choice. The Project Faster reputation is built on durability in the most high-stress environments imaginable. This is why our components are the choice for professional performance builders who cannot afford to compromise on the integrity of their machines. We don't just sell parts; we engineer faster, stronger, and more reliable hardware. This dedication to reliability and expert knowledge is equally critical when managing complex professional affairs in international hubs like Dubai. For those seeking a similar level of precision in legal consultancy, Gulf Legal Advisors provides the expert guidance necessary to navigate the UAE's regulatory environment.
Complete the Performance Package
The Mako swing arm is a cornerstone component in a total performance ecosystem. Combine it with a high-flow exhaust system like the PF Liberator to ensure you have the clearance and power to match your new chassis stability. This is the aesthetic of performance: where the quality of the billet aluminium and the precision of the machining look as good as they work. The Mako is more than an upgrade—it's a statement that you value uncompromising engineering and flawless execution. For enthusiasts who apply this standard of excellence to every part of their lives, including when relocating their home or workshop, VP Smart Removals offers the professional care and precision required to transport high-value equipment safely.
Frequently Asked Questions (FAQ)
**Will the Mako swing arm fit my Harley-Davidson?
** The Mako swing arm is specifically designed for 2009 and newer Harley-Davidson Touring models, including the Road King, Street Glide, Road Glide, and Electra Glide series. It is not compatible with Softail or Dyna models.
**How much weight does a billet swing arm save over the stock Harley part?
** While exact weight varies slightly by year, the Mako billet aluminium swing arm offers a significant reduction in unsprung weight, typically saving several pounds over the stock steel component. This reduction directly improves suspension response and handling agility.
**Do I need to change my shocks when installing a Mako swing arm?
** While you can use your stock shocks, upgrading to high-quality aftermarket shocks is highly recommended to take full advantage of the Mako's benefits. The increased rigidity and reduced unsprung weight will allow performance shocks to function much more effectively.
**What is the difference between the Mako and the Vector swing arm?
** The Mako is engineered for Harley-Davidson Touring models (2009+), while the Project Faster Vector swing arm is designed for 2018 and newer Softail models. Each is optimized for the specific geometry and stresses of its respective chassis.
**Why does the Mako use 6061-T6 aluminium instead of 7075-T6?
** We chose 6061-T6 as the optimal material for a swing arm. While 7075 has a higher tensile strength, 6061 offers superior ductility (resistance to cracking under stress cycles) and far greater corrosion resistance. For a critical chassis part exposed to road conditions, 6061 provides the best balance of strength, safety, and long-term durability.
**Can I use my stock rear brake caliper with the Mako swing arm?
** No, the Mako isn't compatible with the stock brake caliper. To achieve maximum performance, it is designed for seamless integration with 100 or 108mm radial mount brake arms and calipers, which offer a substantial upgrade in stopping power and feel.
**Does the Mako swing arm require special maintenance?
** The Mako requires no special maintenance beyond regular cleaning and inspection, just like any other critical chassis component. Its durable anodized finish and corrosion-resistant 6061-T6 aluminium construction are designed for longevity.
**Will this swing arm improve my Harley's cornering stability?
** Absolutely. This is its primary purpose. By eliminating the lateral flex inherent in the stock swing arm, the Mako provides a rock-solid rear end that tracks perfectly through corners, eliminating the ‘bagger wobble’ and giving the rider significantly more confidence and control.
