SPL Parts FKS Series Front Spherical Caster Rod Bushing Set

2015–2016 BMW 428i xDrive Gran Coupe (F36)

Part #: SPL CRBN F3IX

Overview

The SPL Parts FKS Series Front Spherical Caster Rod Bushing Set is a high-performance upgrade designed specifically for the 2015-2016 BMW 428i xDrive Gran Coupe (F36). Engineered to replace the factory rubber bushings, these spherical bushings provide a significant improvement in suspension response and handling precision. Whether you're a spirited driver, track enthusiast, or simply looking to enhance your vehicle's steering feedback, this bushing set delivers exceptional performance and durability.

By replacing the stock flexible bushings with low-friction, articulating spherical bearings, you'll experience more direct and predictable steering, improved braking stability, and sharper turn-in characteristics. This upgrade is ideal for drivers seeking to maximize their BMW's handling capabilities while maintaining reliable, long-lasting performance.

Key Features

The SPL Parts FKS Series Front Spherical Caster Rod Bushing Set incorporates advanced materials and design features to ensure optimal performance and longevity. Key features include:

• Constructed from high-grade 6061-T6 aluminum, providing a lightweight yet robust housing that withstands rigorous driving conditions.
• Massive 1" FK Racing Bearings with self-lubricating Teflon liners ensure smooth articulation and reduce friction, resulting in more precise suspension movement.
• Articulating spherical bearings eliminate bushing deflection under load, maintaining consistent suspension geometry for improved handling feedback.
• Designed to replace the factory rubber bushings, these spherical bearings help support increased steering response and stability during aggressive driving.
• Precision CNC-machined components ensure perfect fitment and ease of installation without modifications.
• Engineered for durability, these bushings resist wear and maintain performance over time, even under demanding conditions.
• Enhanced suspension articulation helps improve braking performance and cornering grip by reducing unwanted movement and flex.

Construction & Design

The SPL Parts FKS Series bushings feature a high-strength 6061-T6 aluminum housing that is CNC-machined for precise dimensions and a perfect fit. The core of each bushing is equipped with massive FK Racing spherical bearings, which are designed for maximum articulation and minimal friction. The self-lubricating Teflon liners inside the bearings ensure smooth operation and reduce maintenance needs.

This design eliminates the deflection and flex associated with rubber bushings, providing a more direct connection between suspension components. The spherical bearings are engineered to withstand high loads and resist wear, making them suitable for both street and track use. The lightweight construction helps reduce unsprung weight, contributing to improved handling and responsiveness.

Installation & Fitment

The SPL Parts FKS Series bushings are designed as direct bolt-on replacements for the factory caster rod bushings on the specified BMW models. Installation is straightforward for those with basic mechanical skills, and no modifications to the vehicle are required. The precise CNC-machined components ensure a hassle-free fitment, and all necessary hardware is included. It is recommended to follow proper suspension alignment procedures after installation to maximize handling benefits. No special tools beyond standard hand tools are necessary.

• Direct replacement for factory bushings
• No cutting, drilling, or tuning required
• Ideal for street, spirited driving, and track use

What's Included

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

Ideal For

This upgrade is perfect for BMW enthusiasts who want to improve their vehicle's steering response, handling, and overall driving dynamics. It is especially beneficial for those who frequently drive spiritedly on twisty roads or participate in track days. The spherical bushings provide a more direct connection between suspension components, resulting in a more engaging and confident driving experience.