What is the difference between the SPL RTA E9M and the SPL RTA E9X?

These are two separate products for two different drivetrains on the same platform family. The RTA E9M fits the M Version rear subframe geometry used on the E9X M3 and E8X 1M. The RTA E9X fits the non-M rear subframe geometry used across standard E9X 3 Series and E8X 1 Series models. The two rear subframe configurations differ in their arm mounting geometry, which is why SPL engineers separate arms for each. Ordering the wrong version will result in a fitment issue; confirm your exact variant before ordering.

Why is the factory eccentric bolt insufficient for performance alignment on the E9X and E8X M?

Two reasons. First, the factory eccentric bolt travels through a limited angular range that was designed for aligning the car within manufacturer tolerance at stock ride height. Any lowering moves the required toe outside or near the edge of that range. Second, the eccentric is held by friction and torque, which means it can slip under sustained high cornering loads, shifting toe mid-session. The RTA E9M provides a wider range of adjustment through a precision rotating clamp system, and when combined with the optional eccentric lockout kit, the toe position is mechanically fixed rather than friction-dependent.

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

For any car that sees regular track use, yes. The lockout kit eliminates the factory eccentric bolt and replaces the connection with hardware that prevents rotation under load. Without it, the factory eccentric remains in the subframe and can still slip even after the toe arm itself is upgraded. The lockout kit is available from SPL Parts either as a standalone purchase or as a pre-bundled package with the RTA E9M toe arms; the bundle is the most complete rear toe solution for track-prepared M Version builds.

How does replacing the rubber bushing improve rear toe consistency on track?

The factory rubber bushing at the rear toe arm compresses and deflects under the lateral loads of hard cornering and under braking forces. As it deflects, the arm shifts slightly and rear toe changes away from its aligned value dynamically during a corner. The FK spherical bearings in the RTA E9M articulate freely through any range of suspension travel without deflecting; rear toe holds precisely at its aligned value under all load conditions, giving the driver a more predictable and consistent rear end at the limit.

Are replacement rod ends available for the SPL RTA E9M?

Yes. SPL Parts offers both left and right hand thread replacement rod ends for the RTA E9M. Contact SPL Parts directly through their website to confirm the correct replacement for your specific arm.

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Description

SPL Parts Adjustable Bumpsteer Rear Toe Links for E8x / E9x BMW 1M and M3

The SPL Parts RTA E9M eliminates all three of those limitations in one arm. The adjustment range extends significantly beyond the factory eccentric, giving the alignment technician the range needed to optimize toe for any ride height or driving purpose; whether that’s maximum rear stability on a track car or extended tire life through even wear on a street build. The 360-degree rotating clamp with 6061-T6 aluminum clamp body and blue anodized titanium socket head cap screws locks the toe setting precisely without jam nuts; one tool, one step, trackside adjustable. And three-piece FK rod ends manufactured in Connecticut replace the factory rubber bushing entirely with a Teflon-lined spherical bearing that articulates freely under load without deflecting; rear toe holds its set position throughout the suspension’s range of motion rather than shifting as the rubber compresses.

Features

Extended rear toe adjustment range beyond the factory eccentric bolt; necessary for lowered E9X and E8X M models and performance alignment targets
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 design; 6061-T6 aluminum clamp body; blue anodized titanium socket head cap screws; locks toe setting precisely without jam nuts
Three-piece FK rod ends manufactured in Connecticut; Teflon liner chemically bonded to inner race; quiet, self-lubricating articulation with zero bushing deflection under load
Teflon liner operating temperature range: -65°F to 325°F; suitable for street and sustained track use without maintenance
Eliminates dynamic toe change from rubber bushing deflection under cornering and braking loads; rear toe holds its aligned position throughout suspension travel
M Version specific; engineered for E8X M and E9X M rear subframe geometry; not interchangeable with the non-M SPL RTA E9X
Sold as a pair; made in the USA

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 1M: E82 | 2011-2012
BMW M3: E90, E92, E93 | 2007-2013

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

What is the difference between the SPL RTA E9M and the SPL RTA E9X? These are two separate products for two different drivetrains on the same platform family. The RTA E9M fits the M Version rear subframe geometry used on the E9x M3 and E8x 1M. The RTA E9X fits the non-M rear subframe geometry used across standard E9x 3 Series and E8x 1 Series models. The two rear subframe configurations differ in their arm mounting geometry, which is why SPL engineers separate arms for each. Ordering the wrong version will result in a fitment issue; confirm your exact variant before ordering.
Why is the factory eccentric bolt insufficient for performance alignment on the E9x and E8x M? Two reasons. First, the factory eccentric bolt travels through a limited angular range that was designed for aligning the car within manufacturer tolerance at stock ride height. Any lowering moves the required toe outside or near the edge of that range. Second, the eccentric is held by friction and torque, which means it can slip under sustained high cornering loads, shifting toe mid-session. The RTA E9M provides a wider range of adjustment through a precision rotating clamp system, and when combined with the optional eccentric lockout kit, the toe position is mechanically fixed rather than friction-dependent.
Should I add the optional eccentric toe lockout kit with these toe arms? For any car that sees regular track use, yes. The lockout kit eliminates the factory eccentric bolt and replaces the connection with hardware that prevents rotation under load. Without it, the factory eccentric remains in the subframe and can still slip even after the toe arm itself is upgraded. The lockout kit is available from SPL Parts either as a standalone purchase or as a pre-bundled package with the RTA E9M toe arms; the bundle is the most complete rear toe solution for track-prepared M Version builds.
How does replacing the rubber bushing improve rear toe consistency on track? The factory rubber bushing at the rear toe arm compresses and deflects under the lateral loads of hard cornering and under braking forces. As it deflects, the arm shifts slightly and rear toe changes away from its aligned value dynamically during a corner. The FK spherical bearings in the RTA E9M articulate freely through any range of suspension travel without deflecting; rear toe holds precisely at its aligned value under all load conditions, giving the driver a more predictable and consistent rear end at the limit.
Are replacement rod ends available for the SPL RTA E9M? Yes. SPL Parts offers both left and right hand thread replacement rod ends for the RTA E9M. Contact SPL Parts directly through their website to confirm the correct replacement for your specific arm.

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 E8x / E9x BMW 1M and M3 [SPLRTAE9M]

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SPL Parts Adjustable Bumpsteer Rear Toe Links for E8x / E9x BMW 1M and M3

Features

Specifications

Applications

Notes

Frequently Asked Questions

About SPL Parts

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