Why is the factory eccentric washer insufficient for rear camber correction on a lowered F2X or F3X?

The factory eccentric washer at the rear upper arm provides a small range of camber adjustment designed to bring the car to factory specification from the minor variation that exists in production tolerances. Once the car is lowered, the rear suspension geometry moves through an arc that changes camber significantly; the amount of correction needed can easily exceed what the factory eccentric can provide. The SPL RUA F3X replaces the arm entirely with one that has a substantially wider adjustment range, reaching any realistic camber target at any ride height rather than running out of travel before the alignment spec is met.

Does the SPL RUA F3X pair with the SPL RTA F3X rear toe arms?

Yes, and this is the recommended combination for a complete rear alignment solution on the F2X or F3X. The RUA F3X provides rear camber adjustment; the RTA F3X provides rear toe adjustment. On a lowered F2X or F3X, both camber and toe move outside the factory eccentric range simultaneously. Installing both arms gives the alignment technician independent control over both geometry settings. Both the RUA F3X and the RTA F3X are also specifically designed to work with the SPL EL F3X eccentric lockout kit for complete rear geometry lockout on track builds.

Does installing the SPL RUA F3X eliminate bushing deflection at the rear upper arm?

Yes. The factory rear upper arm uses rubber bushings that deflect under cornering, braking, and acceleration loads, allowing camber to change dynamically during a corner. The FK spherical rod ends in the RUA F3X articulate freely without deflecting, holding the camber arm in its set position under all load conditions. This improves rear suspension consistency and the driver's ability to predict how the rear end will behave at the limit.

Does the 360-degree rotating clamp work the same way as on other SPL arms?

Yes. The rotating clamp on the RUA F3X operates the same way as across SPL's full arm lineup; set the camber to the desired value at the alignment rack and lock the clamp with a single 3/16-inch allen key. No jam nuts, no second wrench, no fumbling with bearing orientation while tightening. The setting is locked in one step and is repeatable across sessions.

Are replacement rod ends available if one wears out?

Yes. SPL Parts offers replacement rod ends for the RUA F3X in both left and right hand thread. Contact SPL Parts directly or use the links on the SPL Parts product page for the correct replacement.

Description

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BP PRICING DIFFERENCE

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Description

SPL Parts Adjustable Rear Upper Control Arms for F2x / F3x BMW 1, 2, 3, and 4 Series

Every F2X and F3X BMW leaves the factory with a rear camber setting that is correct for stock ride height. Lower the car, and that camber moves negative; sometimes significantly so, depending on how much the ride height has changed. The factory adjustment mechanism at the rear upper arm is an eccentric washer that was designed to bring the car to factory specification, not to compensate for the geometry shift that lowering introduces. Once the car drops past a certain point, the eccentric runs out of travel before rear camber can be brought back to a proper alignment target, and the owner is left with excess negative camber that causes uneven tire wear and can affect rear grip balance. The SPL Parts RUA F3X is a direct bolt-on replacement for the rear upper link camber arm on the F2x and F3x chassis. It dramatically extends the camber adjustment range beyond the factory eccentric washer, giving alignment technicians the range to bring rear camber back to specification at any realistic ride height, from mildly lowered street setups to full track configurations. The adjustment is made through SPL’s 360-degree rotating clamp with 6061-T6 aluminum clamp body and blue anodized titanium socket head cap screws; locking the camber setting with a single 3/16-inch allen key without jam nuts, without a second tool, and without fumbling with bearing orientation on an alignment rack.

Features

Dramatically increases rear camber adjustment range beyond the factory eccentric washer; corrects rear camber on lowered F2x and F3x builds that have exceeded the factory eccentric’s travel
Gun-drilled 2024 aluminum center links, clamps, and clevises; black anodized for corrosion resistance; gun-drilling reduces unsprung weight
SPL exclusive 360-degree rotating clamp with 6061-T6 aluminum clamp body and blue anodized titanium socket head cap screws; locks camber setting without jam nuts; single allen key adjustment
FK spherical rod ends; self-lubricating Teflon liner chemically bonded to inner race; eliminates rubber bushing deflection under cornering, braking, and acceleration loads
Teflon liner operating temperature range: -65°F to 325°F; no maintenance required
Designed to work alongside the SPL EL F3X eccentric lockout kit for a complete rear camber lockout solution on track-prepared F2x and F3x builds
Pairs naturally with the SPL RTA F3X rear toe arms for a complete rear alignment upgrade

Specifications

Body Material: 2024-T351 aluminum (gun-drilled, black anodized)
Bushings: PTFE-lined FK USA spherical bearings
Adjustment: Camber, track width
Origin: Made in the USA

Applications

BMW 116d: F20, F21 | 2012-2019
BMW 118d: F20, F21 | 2012-2019
BMW 120d: F20, F21 | 2012-2019
BMW 125d: F20, F21 | 2012-2019
BMW 128ti: F20, F21 | 2019-2019
BMW 114i: F20, F21 | 2012-2019
BMW 116i: F20, F21 | 2012-2019
BMW 118i: F20, F21 | 2012-2019
BMW 120i: F20, F21 | 2012-2019
BMW 125i: F20, F21 | 2012-2019
BMW 135i: F20, F21 | 2012-2016
BMW M135i: F20, F21 | 2012-2016
BMW M140i: F20, F21 | 2016-2019
BMW 220d: F22, F23 | 2014-2021
BMW 225d: F22, F23 | 2014-2021
BMW 220i: F22, F23 | 2014-2021
BMW 228i: F22, F23 | 2014-2016
BMW 230i: F22, F23 | 2016-2021
BMW 240i: F22, F23 | 2016-2021
BMW 316d: F30, F31 | 2012-2019
BMW 318d: F30, F31 | 2012-2019
BMW 320d: F30, F31 | 2012-2019
BMW 325d: F30, F31 | 2012-2019
BMW 330d: F30, F31 | 2012-2019
BMW 335d: F30, F31 | 2012-2019
BMW 330e: F30, F31 | 2015-2019
BMW 316i: F30, F31 | 2012-2019
BMW 318i: F30, F31 | 2012-2019
BMW 320i: F30, F31 | 2012-2019
BMW 328i: F30, F31 | 2012-2016
BMW 330i: F30, F31 | 2016-2019
BMW 335i: F30, F31 | 2012-2015
BMW 340i: F30, F31 | 2015-2019
BMW 420d: F32, F33, F36 | 2014-2020
BMW 425d: F32, F33, F36 | 2014-2020
BMW 430d: F32, F33, F36 | 2014-2020
BMW 435d: F32, F33, F36 | 2014-2020
BMW 420i: F32, F33, F36 | 2014-2020
BMW 428i: F32, F33, F36 | 2014-2016
BMW 430i: F32, F33, F36 | 2016-2020
BMW 435i: F32, F33, F36 | 2014-2016
BMW 440i: F32, F33, F36 | 2016-2020
BMW M235i: F22, F23 | 2014-2016
BMW M240i: F22, F23 | 2016-2021
BMW M340i: F30, F31 | 2019-2019

Notes

Installation Instructions
Replacement rod ends available from SPL Parts in left and right hand thread, please contact us
SPL components are made-to-order in the USA; build time will be confirmed at the time of order

Frequently Asked Questions

Why is the factory eccentric washer insufficient for rear camber correction on a lowered F2x or F3x? The factory eccentric washer at the rear upper arm provides a small range of camber adjustment designed to bring the car to factory specification from the minor variation that exists in production tolerances. Once the car is lowered, the rear suspension geometry moves through an arc that changes camber significantly; the amount of correction needed can easily exceed what the factory eccentric can provide. The SPL RUA F3X replaces the arm entirely with one that has a substantially wider adjustment range, reaching any realistic camber target at any ride height rather than running out of travel before the alignment spec is met.
Does the SPL RUA F3X pair with the SPL RTA F3X rear toe arms? Yes, and this is the recommended combination for a complete rear alignment solution on the F2x or F3x. The RUA F3X provides rear camber adjustment; the RTA F3X provides rear toe adjustment. On a lowered F2X or F3X, both camber and toe move outside the factory eccentric range simultaneously. Installing both arms gives the alignment technician independent control over both geometry settings. Both the RUA F3X and the RTA F3X are also specifically designed to work with the SPL EL F3X eccentric lockout kit for complete rear geometry lockout on track builds.
Does installing the SPL RUA F3X eliminate bushing deflection at the rear upper arm? Yes. The factory rear upper arm uses rubber bushings that deflect under cornering, braking, and acceleration loads, allowing camber to change dynamically during a corner. The FK spherical rod ends in the RUA F3X articulate freely without deflecting, holding the camber arm in its set position under all load conditions. This improves rear suspension consistency and the driver’s ability to predict how the rear end will behave at the limit.
Does the 360-degree rotating clamp work the same way as on other SPL arms? Yes. The rotating clamp on the RUA F3X operates the same way as across SPL’s full arm lineup; set the camber to the desired value at the alignment rack and lock the clamp with a single 3/16-inch allen key. No jam nuts, no second wrench, no fumbling with bearing orientation while tightening. The setting is locked in one step and is repeatable across sessions.
Are replacement rod ends available if one wears out? Yes. SPL Parts offers replacement rod ends for the RUA F3X in both left and right hand thread. Contact SPL Parts directly or use the links on the SPL Parts product page for the correct replacement.

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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SPL Parts Adjustable Rear Upper Control Arms for F2x / F3x BMW 1, 2, 3, and 4 Series [SPLRUAF3X]

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SPL Parts Adjustable Rear Upper Control Arms for F2x / F3x BMW 1, 2, 3, and 4 Series

Features

Specifications

Applications

Notes

Frequently Asked Questions

About SPL Parts

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