SPL Parts Adjustable Caster Rod Bushing Set

2021–2023 BMW M3 (G80) / BMW M4 (G82) 3.0L Turbocharged

Part #: SPL CRB G8X

Overview

The SPL Parts Adjustable Caster Rod Bushing Set is a high-performance upgrade designed specifically for the 2021-2023 BMW M3 (G80) and M4 (G82). These front caster rod bushings replace the factory rubber bushings with precision-engineered spherical bearings, offering a significant upgrade in suspension responsiveness and handling precision. Whether you're a spirited street driver, a track enthusiast, or someone seeking to optimize your vehicle's suspension geometry, this set provides the durability and performance needed to elevate your driving experience.

By replacing the stock bushings with low-friction, articulating spherical bearings, you'll experience improved steering feedback, reduced bushing deflection under load, and enhanced stability during aggressive driving. This upgrade helps maintain optimal suspension geometry, which is crucial for precise handling, improved braking, and consistent tire contact with the road surface. The result is a more connected, confident driving feel that transforms your BMW's handling characteristics.

Key Features

The SPL Parts Adjustable Caster Rod Bushing Set incorporates several advanced features designed for maximum performance and durability:

• Massive 1" FK Racing Bearings with self-lubricating Teflon liners ensure smooth articulation and long-lasting performance, even under demanding conditions.
• High-quality CNC-machined offset bearing spacers provide adjustable caster angles of up to +/- 2 degrees, allowing fine-tuning of suspension geometry for optimal handling and tire wear.
• Constructed from durable materials that withstand harsh environments, ensuring longevity and consistent performance over time.
• Designed with precision engineering to eliminate bushing deflection, maintaining suspension alignment during aggressive driving and heavy loads.
• Engineered to replace the factory bushings seamlessly, offering a bolt-on upgrade with minimal modification required.
• Reduces friction and flex in the suspension system, resulting in sharper steering response and improved feedback.
• Ideal for enthusiasts who want to customize their vehicle's handling characteristics and achieve a more precise, responsive feel.

Construction & Design

The SPL Parts caster rod bushings feature CNC-machined aluminum spacers and high-grade spherical bearings, ensuring a perfect fit and robust construction. The use of FK Racing bearings with self-lubricating Teflon liners minimizes maintenance and prevents squeaks or binding over time. The adjustable spacers allow for precise caster angle modifications, giving you the flexibility to tailor your suspension setup to your driving style and conditions. The entire assembly is designed to withstand the rigors of high-performance driving, with corrosion-resistant finishes and high-strength components that ensure durability and consistent performance.

Performance & Sound

By replacing the factory rubber bushings with spherical bearings, you'll notice a more direct and responsive steering feel. The reduction in bushing flex translates to improved handling feedback and more predictable cornering behavior. While this upgrade is primarily focused on handling and suspension geometry, it also contributes to a more engaged driving experience, especially during spirited driving or track days. No specific horsepower or torque gains are claimed, but the enhanced suspension precision supports better overall vehicle dynamics and driver confidence.

Installation & Fitment

The SPL Parts Adjustable Caster Rod Bushing Set is designed as a direct bolt-on upgrade for the front suspension of the 2021-2023 BMW M3 (G80) and M4 (G82). The installation process is straightforward for those with basic mechanical skills, typically requiring standard hand tools. No cutting, drilling, or complex modifications are necessary. Proper alignment is recommended after installation to ensure optimal handling characteristics. The set includes all necessary components and hardware for a complete upgrade.

• Seamless bolt-on installation with factory mounting points
• No special tuning or adjustments required beyond caster angle fine-tuning

What's Included

• Adjustable caster rod bushings with FK Racing spherical bearings
• CNC-machined offset bearing spacers for caster adjustment
• All necessary hardware and mounting components
• Installation instructions

Ideal For

• BMW M3 (G80) and M4 (G82) owners seeking improved handling and suspension precision
• Performance enthusiasts looking to fine-tune caster angles for better steering response
• Track day drivers aiming for maximum suspension control and stability
• Street drivers wanting a more connected and confident driving experience