SPL Parts FKS Series Front Spherical Caster Rod Bushing Set

2014–2016 BMW 428i xDrive / 2013–2015 BMW 335i (F30/F32/F33) 2.0L Turbo

Part #: SPL CRBN F3IX

Overview

The SPL Parts FKS Series Front Spherical Caster Rod Bushing Set is designed to upgrade your BMW's suspension components for enhanced handling and responsiveness. Specifically engineered for the 2014–2016 BMW 428i xDrive and the 2013–2015 BMW 335i (F30), this set replaces the factory rubber bushings with high-performance spherical bearings. Whether you're a spirited street driver, a track enthusiast, or someone seeking improved suspension precision, these bushings deliver noticeable improvements in steering feedback and stability.

By replacing the stock flexible bushings with low-friction, articulating spherical bearings, you'll maintain optimal suspension geometry under load, which translates to better braking, sharper turn-in, and more predictable handling. The use of high-quality materials ensures durability and consistent performance, even under demanding driving conditions. This upgrade is ideal for those looking to push their vehicle's handling capabilities while maintaining a reliable and long-lasting suspension setup.

Key Features

The SPL Parts FKS Series Front Spherical Caster Rod Bushing Set offers a range of advanced features designed to maximize performance and durability:

• Massive 1" FK Racing Bearings with self-lubricating Teflon liners provide low friction articulation, reducing bushing deflection and enhancing steering feel.
• Constructed from 6061-T6 aluminum, the bearings are lightweight yet robust, ensuring longevity and resistance to corrosion.
• Replaces the factory rubber bushings with spherical bearings that eliminate flex and deflection, maintaining precise suspension geometry under load.
• Designed specifically for the front caster rods, these bushings improve handling feedback and steering response for spirited driving and track use.
• Engineered for easy installation with OEM mounting points, requiring no modifications or additional tuning.
• High-quality materials and manufacturing processes ensure consistent performance and durability over time.
• Reduces unwanted suspension movement, helping to support increased steering precision and vehicle control.
• Ideal for enthusiasts seeking a more direct and connected driving experience without sacrificing reliability.

Construction & Design

The SPL Parts FKS Series bushings are meticulously engineered using CNC-machined 6061-T6 aluminum housings that house the massive FK Racing spherical bearings. The bearings feature self-lubricating Teflon liners, which provide smooth articulation and reduce maintenance needs. The spherical design allows for multi-directional movement, eliminating the flex inherent in rubber bushings and ensuring that suspension geometry remains consistent during aggressive driving.

This combination of high-strength aluminum and precision spherical bearings results in a lightweight, durable, and high-performance upgrade. The design also ensures excellent heat dissipation and resistance to wear, making these bushings suitable for both daily driving and track use. The installation process is straightforward, utilizing existing OEM mounting points, and does not require any cutting or modifications.

Installation & Fitment

The SPL Parts FKS Series Front Spherical Caster Rod Bushing Set is designed for a direct bolt-on installation. The process typically involves removing the existing rubber bushings and replacing them with the spherical bearings using standard hand tools. No cutting, drilling, or complex modifications are required, making this an accessible upgrade for most DIY enthusiasts or professional installers. Proper torque specifications should be followed to ensure optimal performance and longevity.

• Easy bolt-on installation using factory mounting points
• No cutting, drilling, or tuning required
• Suitable for street, track, and spirited driving applications

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 owners seeking improved steering response and handling
• Track day enthusiasts looking for precise suspension geometry
• Performance-oriented drivers wanting to reduce bushing flex and deflection
• DIYers and professional mechanics performing suspension upgrades