Cusco Adjustable Rear Upper Arms

2012–2025 Mazda Roadster (ND5RC/NDERC)

Part #: 429 474 LA

Overview

The Cusco Adjustable Rear Upper Arms are high-performance suspension components designed specifically for the Mazda Roadster (ND5RC/NDERC). Engineered to enhance your vehicle's handling and responsiveness, these adjustable arms are an essential upgrade for enthusiasts seeking precise suspension tuning and improved driving dynamics. Whether you're participating in spirited street driving, track days, or motorsport events, these upper arms help you achieve optimal alignment settings and reduce factory bushing slop, resulting in sharper turn-in, better stability, and more confident cornering.

Built with durability and precision in mind, Cusco's suspension parts are trusted by motorsport professionals and passionate drivers alike. By replacing the factory upper arms with these adjustable units, you gain the ability to fine-tune camber and caster angles, allowing for tailored handling characteristics that suit your driving style and conditions. This upgrade not only improves overall vehicle control but also complements other high-performance modifications, making it a versatile choice for your Mazda Roadster.

Key Features

Designed for enthusiasts who demand precise suspension control, the Cusco Adjustable Rear Upper Arms offer several key benefits:

• Constructed from high-strength steel with a durable finish to withstand harsh driving conditions and track use.
• Adjustable design allows for fine-tuning camber and caster angles, optimizing tire contact patch and handling performance.
• Engineered to reduce factory bushing slop, resulting in more direct steering response and improved feedback.
• Precision-machined mounting points ensure a perfect fit and easy installation without modifications.
• Compatible with factory suspension components, making it an ideal upgrade for both street and motorsport applications.
• Part of Cusco's renowned lineup of performance suspension parts, trusted in competitive motorsports and by serious enthusiasts.
• Designed to work seamlessly with other Cusco suspension upgrades for a comprehensive handling improvement.

Construction & Design

The Cusco Adjustable Rear Upper Arms are crafted from high-quality steel, featuring a robust construction that ensures longevity and resistance to fatigue. The arms are designed with precision machining to provide accurate alignment adjustments and a secure fit. The adjustable components are engineered with high-precision threaded rods and lock nuts, allowing for easy and reliable camber and caster tuning. The finish includes a corrosion-resistant coating to maintain appearance and performance over time, even in demanding environments.

Performance & Handling

By upgrading to Cusco's adjustable upper arms, you will notice a significant improvement in your Mazda Roadster's handling characteristics. The ability to precisely set camber angles enhances tire grip during cornering, leading to more predictable and confident driving. The reduction of factory bushing slop translates into more direct steering feedback and improved stability at high speeds. These benefits combine to deliver a more engaging driving experience, whether on the street or the track.

Installation & Fitment

The Cusco Adjustable Rear Upper Arms are designed as a direct bolt-on replacement for the factory components. Installation typically requires basic hand tools and can be completed with standard suspension knowledge. No cutting, drilling, or complex modifications are necessary. For optimal results, a professional alignment is recommended after installation to set the desired camber and caster angles precisely. The process is straightforward for experienced DIY enthusiasts and professional technicians alike.

• Direct bolt-on installation with factory mounting points
• No cutting, drilling, or additional modifications required
• Alignment adjustment needed post-installation for optimal handling

What's Included

• Pair of Cusco Adjustable Rear Upper Arms
• All necessary mounting hardware and lock nuts
• Installation instructions

Ideal For

• Performance-oriented Mazda Roadster owners seeking precise suspension tuning
• Track day enthusiasts aiming for improved cornering grip and stability
• Street drivers wanting enhanced handling and responsiveness
• Those upgrading their suspension for motorsport applications