SPL Parts Front Spherical Caster Rod Bushing Set

2017–2020 BMW 440i xDrive (F32/F33) 3.0L Turbocharged

Part #: SPL CRBN F3IX

Overview

The SPL Parts FKS Series Front Caster Rod Bushings (CRBN) are designed to enhance the handling and steering precision of your BMW 440i xDrive. Specifically engineered for the 2017 to 2020 models, these bushings replace the factory rubber components with high-performance spherical bearings, delivering a more responsive and connected driving experience. Whether you're a spirited street driver or an enthusiast seeking improved track performance, these bushings help you achieve better suspension articulation and feedback.

By upgrading to these spherical bushings, you'll notice a reduction in bushing deflection and friction, which translates to more precise steering and improved stability under load. This upgrade is ideal for drivers who demand maximum performance from their vehicle without sacrificing durability or reliability. The result is a more direct feel at the wheel, enhanced braking response, and a more confident driving experience on twisty roads or during aggressive driving sessions.

Key Features

The SPL Parts FKS Series Bushings incorporate several advanced features to ensure optimal performance and longevity:

• Massive 1" FK Racing Bearings with self-lubricating Teflon liners provide low friction articulation and long-lasting durability, reducing wear over time.
• Constructed from high-quality 6061-T6 aluminum, these bushings are lightweight yet robust, offering excellent strength and resistance to corrosion.
• Designed with precision CNC machining, ensuring perfect fitment and consistent performance across all units.
• The spherical bearing design eliminates the flex and deflection inherent in stock rubber bushings, maintaining optimal suspension geometry under various load conditions.
• Enhanced articulation allows for improved handling response, steering feel, and feedback, especially during aggressive driving or track use.
• Engineered to withstand the rigors of high-performance driving, these bushings are a reliable upgrade for enthusiasts seeking maximum control.
• Easy bolt-on installation with no need for modifications, making it a straightforward upgrade for qualified technicians or experienced DIYers.
• Designed to maintain factory-like fitment while delivering significant performance improvements.

Construction & Design

The SPL Parts CRBN bushings feature a high-precision CNC-machined 6061-T6 aluminum housing that securely holds the FK Racing spherical bearings. The bearings themselves are massive 1" units with self-lubricating Teflon liners, ensuring smooth movement and minimal maintenance. The use of high-grade materials and meticulous manufacturing processes results in a product that offers both durability and consistent performance over time.

The spherical bearing design replaces the stock rubber bushings, which are prone to flex and degradation over time. This design maintains suspension geometry under load, preventing unwanted alignment changes and ensuring predictable handling. The lightweight aluminum construction helps reduce unsprung mass, contributing to improved responsiveness and ride quality.

Installation & Fitment

The SPL Parts CRBN bushings are designed as direct bolt-on replacements for the factory caster rod bushings on the specified BMW models. Installation typically requires basic hand tools and some mechanical knowledge. No cutting, drilling, or complex modifications are necessary, making it a straightforward upgrade for qualified technicians or experienced DIY enthusiasts. Proper alignment is recommended after installation to ensure optimal handling and tire wear.

• Direct bolt-on installation
• No cutting or drilling required
• Compatible with factory mounting points
• Installation time varies but generally takes 1–2 hours

For best results, professional installation and alignment are recommended to ensure precise handling characteristics and to maximize the benefits of this upgrade.

What's Included

• Set of front spherical caster rod bushings with FK Racing bearings
• High-quality aluminum housings
• All necessary hardware and mounting components
• Installation instructions

Ideal For

• BMW enthusiasts seeking improved steering response and handling
• Track day and spirited street drivers
• Owners looking to eliminate bushing flex and maintain suspension geometry under load
• Performance tuning and suspension upgrade aficionados