SPL Parts FKS Series Front Spherical Caster Rod Bushing Set

2017–2020 BMW 440i (F32/F33) / 2013–2015 BMW 335i (F30) 3.0L Turbo

Part #: SPL CRBN F3IX

Overview

The SPL Parts FKS Series Front Spherical Caster Rod Bushing Set is a high-performance upgrade designed specifically for BMW enthusiasts seeking improved handling and suspension precision. Engineered for the 2017–2020 BMW 440i (F32/F33) and the 2013–2015 BMW 335i (F30) with a 3.0L turbocharged engine, this set replaces the factory rubber bushings with low-friction, articulating spherical bearings. The result is a more responsive, predictable steering feel and enhanced stability during spirited driving or track use.

If you're looking to eliminate bushing deflection, reduce friction, and maintain optimal suspension geometry under load, this bushing set is an ideal choice. It is perfect for performance-oriented drivers who want to maximize their vehicle's handling capabilities without sacrificing daily drivability.

Key Features

The SPL Parts FKS Series Front Spherical Caster Rod Bushing Set incorporates advanced materials and design features to deliver superior performance and durability:

• High-Quality Materials: Crafted from 6061-T6 aluminum, these bushings are lightweight yet robust, providing excellent strength and corrosion resistance for long-lasting performance.
• Massive FK Racing Bearings: Equipped with 1" FK Racing spherical bearings featuring self-lubricating Teflon liners, these bushings drastically reduce friction and allow for smooth articulation under load.
• Optimized Suspension Geometry: By replacing the stock bushings with spherical bearings, the set maintains precise suspension alignment, improving handling feedback and reducing unwanted deflection during aggressive driving.
• Enhanced Durability: The combination of high-grade aluminum and self-lubricating bearings ensures consistent performance even under demanding conditions, making it suitable for both street and track use.
• Precision Engineering: Designed with exacting tolerances, these bushings fit perfectly into the factory mounting points, ensuring a straightforward installation process.
• Reduced Friction & Improved Response: The articulating spherical bearings eliminate the flex inherent in rubber bushings, resulting in sharper steering response and more direct feedback from the road.

Construction & Design

The SPL Parts FKS Series bushings are meticulously engineered using CNC-machined 6061-T6 aluminum housings that provide a precise fit and excellent structural integrity. The spherical bearings are manufactured with high-precision FK Racing components, featuring self-lubricating Teflon liners that minimize maintenance and prevent squeaks or binding over time. This combination ensures that the bushings can withstand the rigors of high-performance driving while maintaining consistent performance and alignment.

The design focuses on reducing bushing deflection and friction, which are common sources of vague steering and uneven tire wear. By replacing the flexible rubber with rigid spherical bearings, the suspension maintains its intended geometry under load, translating to improved handling, stability, and driver confidence.

Installation & Fitment

The SPL Parts FKS Series Front Spherical Caster Rod Bushing Set is designed as a direct bolt-on upgrade for the specified BMW models. Installation typically requires basic hand tools and a familiarity with suspension components. No cutting, drilling, or complex modifications are necessary, making it suitable for DIY enthusiasts and professional installers alike. Proper alignment after installation is recommended to ensure optimal handling and tire wear.

• Direct bolt-on replacement for factory bushings
• No cutting, drilling, or tuning required
• Installation time varies but generally takes a few hours

What's Included

• Set of front spherical caster rod bushings with FK Racing bearings
• Aluminum housings and necessary hardware for installation
• Comprehensive instructions for proper installation

Ideal For

• Performance enthusiasts seeking sharper handling
• Track day and spirited driving applications
• Owners looking to eliminate suspension flex and improve steering feedback
• BMW owners who want a durable, long-lasting suspension upgrade