Why replace the factory rubber caster rod bushings with spherical bearings?

Factory rubber bushings deflect under braking and cornering loads, shifting the front suspension geometry away from its set position at the worst possible moments. The SPL Parts CRB E9X replaces them with 1-inch FK spherical bearings that articulate freely without deflecting, keeping the suspension geometry consistent under load. The practical result is more predictable braking, sharper turn-in, and cleaner feedback through the steering wheel on both street and track.

How much caster adjustment do the SPL CRB E9X bushings provide?

The CNC-machined aluminum offset bearing spacers provide up to +/- 4 degrees of caster adjustment, giving alignment technicians meaningful range to optimize the front geometry beyond what the factory eccentric bolts allow. More caster generally improves high-speed stability and steering return-to-center feel, which is a common adjustment priority on track-prepared E9X and F8X builds.

Do these fit xDrive or AWD BMW models?

No. The SPL Parts CRB E9X front caster rod monoball bushings are designed for rear-wheel-drive variants only. They will not fit xDrive or AWD models.

Are OEM caster rod arms included?

No. These are replacement bushings only. The OEM caster rod arms remain in place; the SPL bushings replace the rubber inserts within the existing arms. The OEM arms are not included with this purchase.

What vehicles does the SPL CRB E9X fit?

This bushing set fits 2006-2013 E9X 3 Series including M3, 2008+ E8X 1 Series including 1M, 2014+ F80 M3, 2014+ F82 and F83 M4, and 2016+ F87 M2. RWD models only; xDrive variants are not compatible.

Description

Additional Info

Shipping policy

BP PRICING DIFFERENCE

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Description

SPL Parts Adjustable Front Caster Rod Monoball Bushings for E8x BMW 1 Series, E9x 3 Series, and F8x M2 / M3 / M4

SPL FKS Series Adjustable Front Caster Rod Bushings (CRB) for the BMW E8x, E9x, and F8x replace the soft OEM rubber bushings with low-friction articulating FK USA spherical bearings, eliminating bushing deflection and reducing friction. Massive 1″ FK racing bearings with self-lubricating Teflon liners maintain optimum suspension geometry under braking and cornering load, while integrated caster adjustment lets you dial in exactly the angle you want.

Features

Replaces factory rubber caster rod bushings with low-friction, articulating FK Racing 1-inch spherical bearings; eliminates bushing deflection under braking and cornering load
Self-lubricating Teflon-lined bearings require no greasing and resist wear under sustained track use
CNC-machined 6061-T6 aluminum offset bearing spacers provide up to +/- 4 degrees of caster adjustment
6061-T6 aluminum bearing housing with outer knurl for secure press-fit into the OEM caster rod arm
Maintains optimum suspension geometry under load; improves braking stability and handling feedback
Sold as a pair; includes left and right bushings with hardware
OEM caster rod arms are not included
Made in the USA

Specifications

Material: Billet aluminum mounts
Bushings: 1″ FK USA spherical bearings, Teflon-lined
Adjustment: Caster — wide range
Origin: Made in the USA

Applications

BMW 118d: E81, E82, E87, E88 | 2004-2013
BMW 120d: E81, E82, E87, E88 | 2004-2013
BMW 123d: E81, E82, E87, E88 | 2007-2013
BMW 116i: E81, E82, E87, E88 | 2004-2013
BMW 118i: E81, E82, E87, E88 | 2004-2013
BMW 120i: E81, E82, E87, E88 | 2004-2013
BMW 125i: E81, E82, E87, E88 | 2007-2013
BMW 128i: E81, E82, E87, E88 | 2007-2013
BMW 130i: E81, E82, E87, E88 | 2004-2013
BMW 135i: E81, E82, E87, E88 | 2007-2013
BMW 1M Coupé: E82 | 2011-2012
BMW 318d: E90, E91, E92, E93 | 2005-2013
BMW 320d: E90, E91, E92, E93 | 2005-2013
BMW 325d: E90, E91, E92, E93 | 2005-2013
BMW 330d: E90, E91, E92, E93 | 2005-2013
BMW 335d: E90, E91, E92, E93 | 2006-2013
BMW 335i: E90, E91, E92, E93 | 2006-2013
BMW 316i: E90, E91, E92, E93 | 2005-2013
BMW 318i: E90, E91, E92, E93 | 2005-2013
BMW 320i: E90, E91, E92, E93 | 2005-2013
BMW 323i: E90, E91, E92, E93 | 2005-2011
BMW 325i: E90, E91, E92, E93 | 2005-2013
BMW 328i: E90, E91, E92, E93 | 2005-2013
BMW 330i: E90, E91, E92, E93 | 2005-2013
BMW M3: E90, E92, E93 | 2007-2013
BMW M2: F87 | 2016-2018
BMW M2 Competition: F87 | 2018-2021
BMW M3: F80 | 2014-2018
BMW M4: F82, F83 | 2014-2020

Complete The Kit

Notes

Installation Instructions
OEM Caster Arms not included
SPL components are made-to-order in the USA; build time will be confirmed at the time of order.
Not compatible with xDrive/AWD vehicles

Frequently Asked Questions

Why replace the factory rubber caster rod bushings with spherical bearings? Factory rubber bushings deflect under braking and cornering loads, shifting the front suspension geometry away from its set position at the worst possible moments. The SPL Parts CRB E9X replaces them with 1-inch FK spherical bearings that articulate freely without deflecting, keeping the suspension geometry consistent under load. The practical result is more predictable braking, sharper turn-in, and cleaner feedback through the steering wheel on both street and track.
How much caster adjustment do the SPL CRB E9X bushings provide? The CNC-machined aluminum offset bearing spacers provide up to +/- 4 degrees of caster adjustment, giving alignment technicians meaningful range to optimize the front geometry beyond what the factory eccentric bolts allow. More caster generally improves high-speed stability and steering return-to-center feel, which is a common adjustment priority on track-prepared E9X and F8X builds.
Do these fit xDrive or AWD BMW models? No. The SPL Parts CRB E9X front caster rod monoball bushings are designed for rear-wheel-drive variants only. They will not fit xDrive or AWD models.
Are OEM caster rod arms included? No. These are replacement bushings only. The OEM caster rod arms remain in place; the SPL bushings replace the rubber inserts within the existing arms. The OEM arms are not included with this purchase.
What vehicles does the SPL CRB E9X fit? This bushing set fits 2006-2013 E9X 3 Series including M3, 2008+ E8X 1 Series including 1M, 2014+ F80 M3, 2014+ F82 and F83 M4, and 2016+ F87 M2. RWD models only; xDrive variants are not compatible.

About SPL Parts

SPL Parts is a USA-based manufacturer of high-performance suspension components engineered for both professional racing and demanding street applications. Built on the core principles of strength, lightweight construction, low friction, and precision, SPL Parts products deliver the adjustability and alignment performance required by top race teams and discerning enthusiasts alike. Every component is produced using USA-sourced, certified materials and machined by experienced local shops to exacting tolerances. Professional TIG welders ensure maximum weld integrity, while each part is hand-fitted and treated with anti-seize and 3M internal panel coating for lasting protection. SPL Parts conducts all research and development in-house, allowing the team to leverage firsthand product knowledge and deliver unmatched customer support. Their suspension components feature innovative adjuster designs for quicker, more precise alignments, and utilize spherical bearings with Teflon liners that are self-cleaning, self-lubricating, and built for long service life. From concept to assembly, SPL Parts is made with pride in the USA by skilled machinists and welders who are committed to quality, innovation, and performance.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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