Does the SPL RTA F8X fit both the F8X and G8X generations of M2/M3/M4?

Yes. One part number covers both the F8X generation (2014-2021 F80 M3, F82/F83 M4, F87 M2) and the G8X generation (2021+ G80 M3, G82/G83 M4, G87 M2). The rear toe arm mounting geometry is consistent across both generations for this application.

Why do professional shops run the SPL RTA F8X on every M3 and M4 track build?

Shops that build F80 and F82 M3 and M4s for track use describe these as the best arm to work with reliably in the shop and trackside, citing easy precision adjustability and FK bearings that offer great durability under the demands of high-speed track use. The rotating clamp system is particularly valued in a race environment where alignment needs to be adjusted or verified quickly between sessions; one allen key is all that's needed to lock the setting precisely.

Should I add the optional eccentric lockout kit with these toe arms?

For any build that sees regular track use, yes. The eccentric lockout kit eliminates the factory eccentric bolt entirely, replacing the connection with hardware that cannot rotate under high lateral loads. Without the lockout, the factory eccentric bolt remains in the subframe and can still slip under cornering forces even after the toe arm is upgraded. The lockout kit is available separately or as a pre-bundled package with the RTA F8X.

How does the rotating clamp improve the alignment adjustment experience over jam-nut arms?

Conventional adjustable arms require holding the bearing in the correct orientation while threading and torquing a jam nut; typically a two-person job on a cramped alignment rack. The SPL 360-degree rotating clamp locks both the bearing position and the arm length simultaneously with a single 3/16-inch allen key in one step. Settings are more repeatable, adjustment is faster, and the process can be done alone trackside without specialized equipment.

Are replacement rod ends available for the SPL RTA F8X?

Yes. SPL Parts offers replacement rod ends for the RTA F8X in both left and right hand thread. Use the links on the SPL Parts product page to source the correct replacement, or contact SPL Parts directly.

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Description

SPL Parts Adjustable Bumpsteer Rear Toe Links for F8x / G8x BMW M2 / M3 / M4

The SPL Parts RTA E9X replaces that arm with a purpose-built unit constructed from gun-drilled 2024 aluminum main links that are black anodized for corrosion resistance. The 360-degree rotating clamp with 6061-T6 aluminum clamp body and blue anodized titanium socket head cap screws locks the toe setting precisely with a single 3/16-inch allen key; no jam nuts, no second wrench, no alignment rack fumbling. The adjustment range extends significantly beyond what the factory eccentric can reach, giving the technician the range needed to correctly align a lowered E9x or E8x and dial in the specific toe value that optimizes grip, stability, or tire wear for the car’s intended use. FK spherical rod ends manufactured in Connecticut with self-lubricating, self-cleaning Teflon liners replace the rubber bushing entirely, articulating freely through suspension travel without deflecting. Rear toe holds its set position under braking, cornering, and acceleration loads rather than shifting with the rubber’s compliance. The Teflon liner is chemically bonded to the inner race; it operates from -65°F to 325°F without maintenance and provides the high load carrying capacity and dynamic wear resistance needed for track use.

Features

Extended rear toe adjustment range beyond the factory eccentric bolt; covers lowered builds, performance alignment targets, and full race setup requirements
Gun-drilled 2024 aluminum main links; black anodized for corrosion resistance; gun-drilling reduces unsprung weight without compromising structural integrity
SPL exclusive 360-degree rotating clamp with 6061-T6 aluminum clamp body and blue anodized titanium socket head cap screws; locks toe precisely without jam nuts; single allen key adjustment
FK spherical rod ends manufactured in Connecticut; self-lubricating, self-cleaning Teflon liner chemically bonded to inner race; zero bushing deflection under load
Teflon liner operating temperature range: -65°F to 325°F; reliable for sustained street and track use without maintenance
Eliminates dynamic toe change from rubber bushing deflection under cornering, braking, and acceleration loads; rear toe holds its aligned value consistently

Specifications

Body Material: 2024-T351 aluminum (gun-drilled, black anodized)
Heim Joints: PTFE-lined FK USA spherical bearings
Toe Adjustment: Wide range, past OEM eccentric limits
Bumpsteer Adjustment: Yes — fine spacers included
Origin: Made in the USA

Applications

BMW M2: F87, G87 | 2016-present
BMW M3: F80, G80, G81, G82 | 2014-present
BMW M4: F82, F83, G83 | 2014-present

Notes

Installation Instructions
Replacement rod ends available from SPL Parts 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

Does the SPL RTA F8X fit both the F8x and G8x generations of M2 / M3 / M4? Yes. One part number covers both the F8x generation and the G8x generation. The rear toe arm mounting geometry is consistent across both generations for this application.
Why do professional shops run the SPL RTA F8X on every M3 and M4 track build? Shops that build F80 and F82 M3 and M4s for track use describe these as the best arm to work with reliably in the shop and trackside, citing easy precision adjustability and FK bearings that offer great durability under the demands of high-speed track use. The rotating clamp system is particularly valued in a race environment where alignment needs to be adjusted or verified quickly between sessions; one allen key is all that’s needed to lock the setting precisely.
Should I add the optional eccentric lockout kit with these toe arms? For any build that sees regular track use, yes. The eccentric lockout kit eliminates the factory eccentric bolt entirely, replacing the connection with hardware that cannot rotate under high lateral loads. Without the lockout, the factory eccentric bolt remains in the subframe and can still slip under cornering forces even after the toe arm is upgraded. The lockout kit is available separately or as a pre-bundled package with the RTA F8X.
How does the rotating clamp improve the alignment adjustment experience over jam-nut arms? Conventional adjustable arms require holding the bearing in the correct orientation while threading and torquing a jam nut; typically a two-person job on a cramped alignment rack. The SPL 360-degree rotating clamp locks both the bearing position and the arm length simultaneously with a single 3/16-inch allen key in one step. Settings are more repeatable, adjustment is faster, and the process can be done alone trackside without specialized equipment.
Are replacement rod ends available for the SPL RTA F8X? Yes. SPL Parts offers replacement rod ends for the RTA F8X in both left and right hand thread. Use the links on the SPL Parts product page to source the correct replacement, or contact Bulletproof Sales Team.

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 Bumpsteer Rear Toe Links for F8x / G8x BMW M2 / M3 / M4 [SPLRTAF8X]

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SPL Parts Adjustable Bumpsteer Rear Toe Links for F8x / G8x BMW M2 / M3 / M4

Features

Specifications

Applications

Notes

Frequently Asked Questions

About SPL Parts

Reviews