SPL Parts Front Spherical Caster Rod Bushing Set

2020–2021 BMW M135i (F20) / 2013–2015 BMW 335i (F30) with 3-Series Models

Part #: SPL CRBN F3IX

Overview

The SPL Parts FKS Series Front Spherical Caster Rod Bushings (CRBN) are designed to enhance the handling and steering response of your BMW. Specifically engineered for the 2020–2021 BMW M135i (F20) and the 2013–2015 BMW 335i (F30), these bushings replace the factory rubber components with high-performance spherical bearings. This upgrade is ideal for enthusiasts seeking improved suspension precision, reduced bushing deflection, and a more direct steering feel.

By replacing the stock flexible bushings with low-friction, articulating spherical bearings, you'll experience a significant reduction in bushing flex under load. This results in more consistent suspension geometry during aggressive driving, improved braking feedback, and sharper handling characteristics. Whether you're on the street or at the track, these bushings help support your vehicle's performance and responsiveness.

Key Features

The SPL Parts CRBN bushings incorporate advanced materials and precision engineering to deliver maximum durability and performance. Key features include:

• High-quality FK Racing Bearings with massive 1" diameter for superior load capacity and stability.
• Self-lubricating Teflon liners within the spherical bearings to minimize friction and maintenance requirements.
• 6061-T6 aluminum bearing housings that provide a lightweight yet robust structure, ensuring longevity and resistance to corrosion.
• Articulating design that maintains optimal suspension geometry under load, reducing deflection and improving handling feedback.
• Precision CNC-machined components for a perfect fit and easy installation.
• Engineered to withstand the rigors of spirited driving and track use, offering consistent performance over time.

Construction & Design

The CRBN bushings feature a durable construction combining lightweight 6061-T6 aluminum housings with high-performance FK Racing spherical bearings. The spherical bearings are designed with self-lubricating Teflon liners, which eliminate the need for regular maintenance and ensure smooth articulation. The use of massive 1" FK bearings provides exceptional load distribution and stability, making these bushings suitable for aggressive driving scenarios.

The design emphasizes maintaining suspension geometry and reducing flex, which translates into more precise steering and improved handling. The components are CNC-machined for exact tolerances, ensuring a seamless fit and reliable operation. The aluminum housings are anodized for corrosion resistance, extending the lifespan of the upgrade even in harsh conditions.

Performance & Handling

Upgrading to SPL Parts FKS Series Spherical Caster Rod Bushings significantly enhances your vehicle's handling dynamics. The reduction in bushing flex leads to more direct steering response and improved feedback during cornering and braking. These bushings help support increased suspension stability, allowing you to push your BMW harder with confidence. While specific horsepower or torque gains are not claimed, the improved suspension precision contributes to a more engaging and controlled driving experience.

Installation & Fitment

The SPL Parts CRBN bushings are designed as direct bolt-on replacements for the factory caster rod bushings. Installation typically involves removing the existing bushings and pressing in the new spherical bearings. No cutting, drilling, or complex modifications are required, making this an accessible upgrade for experienced DIY enthusiasts and professional technicians alike. Proper alignment after installation is recommended to maximize performance benefits.

• Direct replacement for factory bushings
• No cutting, drilling, or tuning required
• Compatible with 2020–2021 BMW M135i (F20) and 2013–2015 BMW 335i (F30) models

What's Included

• Set of front spherical caster rod bushings with FK Racing bearings
• Aluminum bearing housings
• All necessary hardware and installation instructions

Ideal For

• BMW enthusiasts seeking improved handling and steering response
• Track day and spirited driving applications
• Owners looking to reduce suspension flex and maintain optimal geometry under load