How does in-car camber adjustment without removing the arm actually work?

The curved profile of the G8X upper wishbone arm provides the clearance geometry needed to access the double adjuster while the arm is installed in the car. The adjuster is turned to dial in the desired camber value; the 360-degree rotating clamp then locks it in place with a single allen key without jam nuts. The arm stays on the car throughout this process. For a race team or driver making session-to-session camber changes, this eliminates what would otherwise be a significant disassembly task.

Why does the G8X M3 and M4 specifically need adjustable rear upper arms?

The G8X M cars have an aggressive rear camber curve through bump travel; as the rear suspension compresses, camber goes negative significantly. This is by design for dynamic cornering performance at factory ride height. Lowering the car accelerates that curve, pushing camber further negative than the factory eccentric can correct, causing premature inner tire shoulder wear and reducing rear traction under acceleration. The SPL RUA G8X provides the extended camber adjustment range to bring camber back to the optimal target at the car's actual ride height, whether that's a mild street drop or a full track stance.

Are replacement rod ends available for the SPL RUA G8X?

Yes. SPL Parts offers replacement rod ends for the RUA G8X 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.

Is there an xDrive version of the SPL RUA G8X?

The source material and SPL's current product lineup do not list an xDrive-specific RUA G8X. This kit is listed for G80, G82, G83, and G87; confirm your drivetrain configuration with SPL Parts before ordering if you have a G8X xDrive model.

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Description

SPL Parts Adjustable Rear Upper Camber Arms for G8x BMW M2 / M3 / M4

The G8x M3 and M4 carry an aggressive rear camber curve through bump travel; a geometry characteristic that becomes a practical problem as soon as the car is lowered. The camber goes negative faster than the factory eccentric adjustment can compensate for, tire inner edges wear unevenly, and the rear grip balance shifts in ways that neither springs, dampers, nor factory alignment range can resolve. The SPL Parts RUA G8X addresses the root cause by providing a wide adjustment range that covers any camber target the car needs at any ride height; the factory eccentric limitation is gone, replaced by a system that puts the driver and alignment technician in control of the geometry. What sets the G8x kit apart from the F8X version is the curved 6061-T6 billet aluminum upper camber arm with SPL’s double adjuster design. The curved geometry and double adjuster combination allows camber to be adjusted without removing the arm from the vehicle; the adjuster is accessible and can be turned to the desired setting and locked without disassembly. This is a meaningful practical improvement for cars that are frequently re-aligned or adjusted between track sessions; changing camber becomes a trackside task rather than a workshop job.

Features

Complete four-arm rear upper kit; replaces the factory rear wishbone (camber arm) and rear guide link (traction arm) at both rear corners
Curved 6061-T6 billet aluminum upper camber arm with double adjuster; allows camber adjustment without removing the arm from the vehicle
Gun-drilled 2024 aluminum guide links (traction arms); black anodized for corrosion resistance; reduces unsprung weight
SPL exclusive 360-degree rotating clamp with blue anodized titanium socket head cap screws; locks settings without jam nuts
FK spherical rod ends manufactured in Connecticut; self-lubricating, self-cleaning Teflon liner chemically bonded to inner race; eliminates rubber bushing deflection under load
Teflon liner operating temperature range: -65°F to 325°F; no maintenance required
Tapered stainless steel knuckle mount spacers for precise rear knuckle fitment

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 M2: G87 | 2023-present
BMW M3: G80, G81 | 2021-present
BMW M4: G82, G83 | 2021-present

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

What is the key difference between the SPL RUA G8X and the SPL RUA F8X for the previous generation? Both kits include the rear wishbone (camber arm) and rear guide link (traction arm) for a total of four arms per car. The critical difference is the camber arm design. The G8x version uses a curved 6061-T6 billet aluminum upper arm with SPL’s double adjuster that allows camber to be adjusted without removing the arm from the vehicle; the adjuster is accessible with the suspension loaded. The F8x version uses a straight arm that requires removal for camber adjustment. This makes the G8x kit significantly more practical for frequent trackside camber changes. The two kits are generation-specific and not interchangeable.
How does in-car camber adjustment without removing the arm actually work? The curved profile of the G8x upper wishbone arm provides the clearance geometry needed to access the double adjuster while the arm is installed in the car. The adjuster is turned to dial in the desired camber value; the 360-degree rotating clamp then locks it in place with a single allen key without jam nuts. The arm stays on the car throughout this process. For a race team or driver making session-to-session camber changes, this eliminates what would otherwise be a significant disassembly task.
Why does the G8x M3 and M4 specifically need adjustable rear upper arms? The G8x M cars have an aggressive rear camber curve through bump travel; as the rear suspension compresses, camber goes negative significantly. This is by design for dynamic cornering performance at factory ride height. Lowering the car accelerates that curve, pushing camber further negative than the factory eccentric can correct, causing premature inner tire shoulder wear and reducing rear traction under acceleration. The SPL RUA G8X provides the extended camber adjustment range to bring camber back to the optimal target at the car’s actual ride height, whether that’s a mild street drop or a full track stance.
Are replacement rod ends available for the SPL RUA G8X? Yes. SPL Parts offers replacement rod ends for the RUA G8X in both left and right hand thread. Contact Bulletproof Sales Team
Is there an xDrive version of the SPL RUA G8X? The source material and SPL’s current product lineup do not list an xDrive-specific RUA G8X. This kit is listed for G80, G82, G83, and G87; confirm your drivetrain configuration with Bulletproof Sales before ordering if you have a G8x xDrive model.

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 Camber Arms for G8x BMW M2 / M3 / M4 [SPLRUAG8X]

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SPL Parts Adjustable Rear Upper Camber Arms for G8x BMW M2 / M3 / M4

Features

Specifications

Applications

Notes

Frequently Asked Questions

About SPL Parts

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