SPL Bumpsteer Adjustable Tie Rod Ends – BMW E8X / E9X / F2X / F3X / F8X / G2X / G8X / G42

OVERVIEW

SPL Parts front Tie Rod Ends (TRE) let the tie rod end pivot be relocated with stainless steel spacers, correcting the bump steer created by lowering or by modified caster and lower arm geometry. On a lowered car the stock joint pulls the wheel through a toe change every time the suspension moves — darting over mid-corner bumps, tramlining on the highway and nervousness under braking. Putting the joint back on the correct plane gives more predictable handling, less inside-shoulder tire wear and better stability over rough roads and track curbing, especially while braking and turning. On significantly lowered cars it also keeps the tie rod end from binding at full droop and protects the inner tie rods from bending or breaking in race conditions.

The E9X / F3X / F8X version uses custom CNC machined 6061-T6 billet aluminum curved turnbuckles that maximize articulation and allow full droop travel, Teflon-lined FK rod ends, 1/4" and 1/8" tapered stainless bumpsteer spacers and blue anodized titanium hardware. The G8X version has a 6061-T6 aluminum tie rod body, 4140 chromoly tapered stud, 304 stainless 1/8" spacers, Ti-6Al-4V titanium hardware and maintenance-free US-made PTFE-lined FK bearings at 1.49 lb per side.

SPECS

• Relocatable tie rod end pivot for a large range of bumpsteer correction
• Low friction Teflon / PTFE-lined FK bearings and rod ends
• E9X: custom CNC machined 6061-T6 billet aluminum curved turnbuckles for full droop travel
• E9X: 1/4" and 1/8" stainless steel bumpsteer spacers with tapered ends for extra misalignment
• E9X: ASTM A574 socket head cap bolts, minimum tensile strength 170,000 psi
• G8X: 6061-T6 aluminum tie rod body, 4140 chromoly tapered stud, 304 stainless 1/8" spacers
• G8X: 1.49 lb (0.68 kg) per side, 3% lighter than OEM
• Blue anodized Ti-6Al-4V titanium hardware
• Sold as a pair (one pair per vehicle)
• Made in the USA

PARTS INCLUDED

• Two SPL Parts bumpsteer adjustable tie rod ends with FK bearings and titanium hardware
• Stainless steel bumpsteer spacers
• Complete kit as supplied by SPL Parts; see the installation instructions for the full bill of materials

TECH RESOURCES

Additional Parts Required

• Four-wheel alignment after installation — mandatory. Front toe must be reset once the tie rod ends are fitted.
• Professional installation is recommended; these are safety-critical suspension components.
• Corner weighting is recommended for track use.
• Setting bumpsteer properly requires the car at ride height with the suspension cycled and toe measured through travel; budget shop time beyond a standard alignment.
• Bump steer is measured against lower arm and caster geometry, so these are most useful alongside the SPL Front Lower Control Arms and the SPL Front Tension Rods / Caster Rods.

Installation

• SPL Parts SPL TRE E9X bumpsteer adjustable tie rod ends — installation instructions (PDF)
• SPL Parts SPL TRE G8X bumpsteer adjustable tie rod ends — installation instructions (PDF)

Notes

• G20 / G22 / G42 non-M cars: check the build sheet before ordering. SPL TRE G8X fits G2X and G42 cars only when equipped with Sport Adaptive Steering (option 2LV, 16 mm tie rod). M240i, M340i and M440i come with 2LV; non-2LV G2X / G42 cars use the 14 mm tie rod and take SPL TRE E9X instead.
• The Toyota GR Supra / BMW Z4 G29 version is listed separately: SPL Bumpsteer Adjustable Tie Rod Ends – Toyota GR Supra A90 / BMW Z4 G29.
• SPL TRE E9X replaces BMW 32 10 6 767 781 / 782 and 32 10 6 799 966 / 967. SPL TRE G8X replaces 32 10 5 A38 DE8 / DE6 and 32 10 6 887 400 / 402.
• Spherical bearings transmit more road noise and vibration into the cabin than the rubber bushings they replace. This is normal for this type of part.
• Price is for parts only; labor and alignment are not included.
• Confirm your exact model, chassis code and drivetrain with Speed Logic before ordering.

PART NUMBER

• SPL TRE E9X — E82 / E88 135i and 1M, E90 / E92 / E93 335i, F2X / F3X 2, 3 and 4 Series, F80 M3, F82 / F83 M4, F87 M2, and G2X / G42 without option 2LV
• SPL TRE G8X — G80 M3, G82 / G83 M4, G87 M2, and G2X / G42 with option 2LV only

VEHICLE APPLICATIONS