SPL Parts 06-13 BMW 3 Series/1 Series (E9X/E8X)/F8X Front Tension Rods

Front Caster Adjustment for BMW 3 Series, 1 Series, M3, M4, and M2 with SPL TR E9X

The SPL TR E9X replaces the factory tension rod on BMW E9X 3 Series, E8X 1 Series, and compatible F8X M-Series models with a fully adjustable, gun-drilled 2024 billet aluminum assembly that provides a wide range of front caster adjustment. Caster tuning with the SPL TR E9X optimizes turn-in response, corrects left-to-right caster variances common on modified or crashed vehicles, and allows anti-dive geometry tuning using the included stainless steel spacers. Hardened JMX FK rod ends replace the factory rubber bushing, eliminating compliance and delivering direct, predictable front end feel. These will not fit xDrive or AWD vehicles.

Features and Benefits

• Gun-drilled and black anodized 2024 aluminum main links reduce unsprung weight while maintaining high strength and stiffness
• 360-degree rotating 6061-T6 aluminum clamp design allows quick, on-car caster adjustment without jam nuts
• Blue anodized Ti-6Al-4V titanium socket head cap screws for lightweight, corrosion-resistant clamping
• Hardened JMX high-misalignment, low-friction 3-piece PTFE-lined FK Heim joints for quiet, smooth articulation from -65 to 325 degrees F
• ASTM A574 socket head cap bolts with minimum tensile strength of 170,000 psi for maximum articulation and reliability
• Stainless steel anti-dive spacers included for anti-dive geometry tuning
• Wide caster adjustment range to compensate for lowering, alignment variance, or track setup requirements
• Sold as a pair; made in the USA
• Not compatible with xDrive or AWD vehicles

Fitment

Specifications

What Is Included

• 2 x gun-drilled 2024 aluminum front tension rods (SPL TR E9X)
• 360-degree rotating 6061-T6 aluminum clamps
• Hardened JMX PTFE-lined FK Heim joints
• Blue anodized titanium socket head cap screws
• Stainless steel anti-dive spacers
• ASTM A574 socket head cap bolts
• Installation instructions

Frequently Asked Questions

What adjustment does the SPL TR E9X provide?
The SPL TR E9X provides front caster adjustment, allowing you to dial in optimal turn-in response, correct left-to-right caster variance, and tune anti-dive geometry using the included stainless steel spacers. This is critical for lowered vehicles and track setups where caster angle affects steering feel and stability.

How much caster can I add with the SPL TR E9X?
The rotating clamp design provides a wide caster adjustment range beyond OEM limits, giving alignment technicians the travel needed for both street performance and dedicated track configurations on E9X, E8X, and compatible F8X platforms.

Will the SPL TR E9X fit my xDrive or AWD BMW?
No. The SPL TR E9X is designed for rear-wheel-drive E9X, E8X, and F8X models only. It is not compatible with xDrive or AWD variants.

Is the SPL TR E9X street legal?
Yes. The SPL TR E9X is a suspension alignment component and does not affect emissions or safety systems. It is appropriate for street use in all 50 states. A professional wheel alignment is required after installation.

What are the anti-dive spacers used for?
The included stainless steel spacers allow you to adjust the front anti-dive geometry by repositioning the tension rod pivot point. This can reduce front dive under hard braking, which is beneficial for track-focused vehicles.

How do I know the correct length to set the SPL TR E9X?
Pre-set the SPL TR E9X to match the center-to-center length of the OEM tension rod before installation. Final caster setting is confirmed on an alignment rack after installation.

Does installing the SPL TR E9X void my factory warranty?
Under the Magnuson-Moss Warranty Act, a manufacturer cannot void your powertrain warranty solely because you installed an aftermarket suspension part, unless they can prove the part directly caused the failure. Consult your dealer for details on your situation.

What makes the JMX rod end different from a standard FK rod end?
The JMX is a hardened, high-misalignment version of the FK spherical bearing rod end, engineered to withstand the higher lateral and axial loads encountered in a front tension rod application where misalignment angles can be significant.

Installation Instructions

1. Safely raise and support the vehicle on jack stands; remove the front wheels for clear access to the tension rod mounting points.
2. Photograph the OEM tension rod position and record existing caster measurements if available.
3. Remove the OEM tension rod mounting bolts (typically 18mm) and remove the OEM arm.
4. Place the SPL TR E9X alongside the OEM arm and pre-set it to the same center-to-center length with equal thread engagement on both adjuster ends.
5. Install the desired anti-dive spacers at the chassis mount if adjusting anti-dive geometry.
6. Install the SPL TR E9X using OEM or supplied hardware; snug only until the vehicle is at ride height.
7. Lower the vehicle to ride height and torque mounting bolts to factory specification.
8. Tighten the 360-degree rotating clamps with a 3/16-inch hex key to lock the adjuster in place.
9. Have the vehicle professionally aligned on a four-wheel alignment rack before driving.

Proposition 65 Warning: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, visit www.p65warnings.ca.gov.