SPL Parts FKS Series Front Caster Rod Bushing Set

2017–2020 BMW 440i xDrive Gran Coupe (F36)

Part #: SPL CRBN F3IX

Overview

The SPL Parts FKS Series Front Caster Rod Bushing Set is designed to enhance the handling and steering response of your BMW 440i xDrive Gran Coupe (F36) from 2017 to 2020. Replacing the factory rubber bushings with high-performance spherical bearings, this set provides a significant upgrade in suspension precision and feedback. Whether you're a spirited driver, track enthusiast, or someone seeking improved road manners, these bushings help maintain optimal suspension geometry under load, resulting in better braking, cornering, and overall driving feel.

Constructed with durability and performance in mind, the SPL FKS Series bushings eliminate bushing deflection and reduce friction, ensuring your vehicle responds more directly to your steering inputs. This upgrade is ideal for those looking to improve handling characteristics without sacrificing daily drivability.

Key Features

The SPL Parts FKS Series Front Caster Rod Bushing Set incorporates advanced materials and engineering to deliver superior performance:

• High-quality 6061-T6 aluminum bearing housings provide excellent strength and corrosion resistance, ensuring long-lasting durability even under aggressive driving conditions.
• Massive 1" FK Racing spherical bearings with self-lubricating Teflon liners eliminate the flex and deflection associated with stock rubber bushings, resulting in more precise suspension articulation.
• Articulating spherical design maintains consistent suspension geometry during load transfer, improving handling feedback and stability.
• Engineered to replace the stock bushings seamlessly, ensuring a straightforward installation process with no modifications required.
• Designed specifically for the front caster rods, these bushings optimize steering response and help support increased performance tuning.
• Manufactured with precision CNC machining to ensure perfect fitment and finish.
• Reduces bushing deflection under load, translating to more predictable and responsive handling characteristics.

Construction & Design

The SPL Parts FKS Series bushings feature a robust construction combining lightweight, high-strength 6061-T6 aluminum housings with massive FK Racing spherical bearings. The spherical bearings are designed with self-lubricating Teflon liners, which minimize maintenance and maximize performance. The one-piece aluminum housings are CNC-machined for precise fitment, ensuring that each bushing maintains its shape and alignment over time. This design not only enhances durability but also contributes to a cleaner, more aggressive appearance under the hood.

The articulation provided by the spherical bearings allows for maximum suspension movement without the deflection typical of rubber bushings. This results in improved steering feel, reduced understeer or oversteer tendencies, and more consistent handling during aggressive driving or track use. The use of high-quality materials ensures resistance to corrosion and wear, making these bushings suitable for both street and track applications.

Installation & Fitment

The SPL Parts FKS Series Front Caster Rod Bushing Set is designed as a direct bolt-on upgrade for the specified vehicle. Installation typically involves removing the existing bushings and pressing in the new spherical bearings into the aluminum housings. No cutting, drilling, or complex modifications are required, making it suitable for DIY enthusiasts with basic mechanical skills. It is recommended to use proper tools and follow installation instructions for optimal results. For best performance, an alignment is advised after installation to ensure proper suspension geometry.

• Seamless bolt-on installation with no modifications needed
• Compatible with 2017–2020 BMW 440i xDrive Gran Coupe (F36)
• Designed for use with stock or upgraded suspension components

What's Included

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

Ideal For

This bushing set is perfect for BMW enthusiasts seeking to improve their vehicle's handling, steering response, and overall driving experience. It is well-suited for street drivers, autocrossers, and track day participants who want to maximize suspension performance and feedback. The durable construction ensures reliable performance under demanding conditions, making it a valuable upgrade for performance-oriented builds.