Lightweight Performance: A Technical Guide to Scarlet Racing Alloy Swing Arms for CRF, KLX, and WR 155

Scarlet Swing Arm

In the world of off-road and dual-purpose motorcycling, the "unsprung weight" of a bike is a critical factor that often determines the quality of handling and maneuverability. For riders of the Honda CRF 150L, Kawasaki KLX 150, and Yamaha WR 155 R, one of the most effective ways to reduce this weight while enhancing structural rigidity is by upgrading the factory steel swing arm to a high-grade aluminum alloy version.

Among the various aftermarket options available in the international market, Scarlet Racing has established itself as a leading brand, offering a balance of aesthetic appeal, weight reduction, and technical durability. This article provides a comprehensive look at why an alloy swing arm upgrade is essential and what makes the Scarlet Racing series a top choice for riders worldwide.

The Science of Unsprung Weight and Handling

To understand the value of the Scarlet Racing Swing Arm, one must first understand the concept of unsprung weight. This refers to the weight of the components not supported by the suspension—such as the wheels, tires, brakes, and the swing arm itself.

When a motorcycle hits a bump at high speed, the suspension must move the unsprung weight upward and then quickly back down to maintain tire contact with the ground. A heavy, stock steel swing arm has more inertia, making it harder for the rear shock to control. By switching to a Scarlet Racing Alloy Swing Arm, which is significantly lighter than the original equipment manufacturer (OEM) part, the suspension can react faster. This results in:

• Improved Traction: The rear tire stays glued to the terrain more effectively.

• Sharper Handling: The bike feels more flickable and responsive in tight corners.

• Reduced Fatigue: A more compliant rear end means less vibration transferred to the rider.

---

Technical Specifications: Material and Dimensions

Install on crf 150L

Scarlet Racing utilizes high-grade Aluminum Alloy for their swing arms, ensuring that the reduction in weight does not come at the expense of strength. Steel is strong but heavy and prone to rust; alloy, on the other hand, provides excellent corrosion resistance and a superior strength-to-weight ratio.

Dual Length Options: 60cm and 66cm

Understanding that different riders have different needs, Scarlet Racing offers two specific length configurations:

1. The 60cm Version: This is typically closer to the standard length, maintaining the bike’s original wheelbase for those who prioritize agility and quick turning in technical "hard enduro" environments.

2. The 66cm Version: An extended length is often preferred by riders who use larger wheel sets (such as 18/21-inch combos with aggressive knobby tires) or those who participate in hill climbs and high-speed desert crossings. The extra length provides increased stability at high speeds and prevents the front end from lifting too easily under hard acceleration.

Precision Engineering

The construction of these swing arms involves precise welding and CNC-machined pivot points. This ensures that the rear axle stays perfectly aligned, which is crucial for chain longevity and consistent braking performance.

---

Aesthetic Customization: Beyond Performance

For many riders, the look of the motorcycle is just as important as how it handles. Scarlet Racing is well-known for its vibrant and durable finishes. Unlike painted surfaces that chip easily when hit by flying rocks, these swing arms feature high-quality coatings available in a wide spectrum of colors:

• Classic Tones: Black, Silver, and Blue for a factory-pro or stealthy look.

• Vibrant Accents: Red (perfect for CRF builds), Yellow (popular for Suzuki or Yamaha enthusiasts), and Green (the iconic Kawasaki hue).

These color options allow riders to build a "dream bike" that stands out at the track or on the trail while maintaining a professional, high-end finish.

---

Compatibility: A Universal Solution for the "Big Three"

The Scarlet Racing Alloy Swing Arm is engineered specifically for the most popular dual-purpose platforms in the world:

• Honda CRF 150L: Transforms the entry-level feel into a serious competition machine.

• Kawasaki KLX 150: Provides the much-needed weight relief for this legendary platform.

• Yamaha WR 155 R: Complements the high-tech liquid-cooled engine with a high-tech chassis component.

Each unit is designed as a Plug-and-Play component, meaning it utilizes the original mounting points, making the installation process straightforward for those with basic mechanical knowledge.

---

International Sourcing: Price and Export Logistics

Red Swing Arm Scarlet

As the demand for Indonesian-engineered motorcycle parts grows in countries like Brazil, Thailand, and Australia, understanding the logistics of international procurement is vital for a smooth buying experience.

Global Pricing

The Scarlet Racing Alloy Swing Arm is positioned as a premium yet accessible upgrade. The base export price for this unit is approximately $155.00 USD. Given the high cost of raw aluminum alloy and the complexity of the manufacturing process, this represents exceptional value for a performance-oriented chassis part.

Export and Shipping Information

For international buyers, it is important to factor in the logistics of shipping a large-dimension item:

1. Shipping Cost: The price of $155.00 USD does not include international postage. Because a swing arm is a relatively large item, shipping costs will vary significantly depending on the destination country and the speed of the courier service.

2. Customs and Duties: Every country has its own set of import regulations. Buyers should be prepared for potential import taxes or customs fees upon the item's arrival in their home country.

3. Secure Export Packaging: We prioritize heavy-duty packaging to ensure that the alloy finish remains pristine during long-distance air or sea freight.

---

Final Thoughts

Upgrading to a Scarlet Racing Alloy Swing Arm is one of the most substantial improvements a rider can make to a CRF, KLX, or WR 155. By shedding unnecessary weight and gaining the ability to choose a custom length and color, you are not just modifying a bike—you are optimizing it for better performance and longevity.

Our Export Services

While our mission is to provide technical education to the global riding community, we also specialize in the international distribution of these premium components. We offer the original Scarlet Racing Alloy Swing Arm (60cm/66cm) for $155.00 USD (excluding shipping).

If you are ready to take your bike’s handling to the next level and need a reliable partner to handle the export logistics to your country, please visit our Contact Us page. Our team is ready to provide a personalized shipping quote and ensure your upgrade journey is seamless from order to installation.