The SPL Parts Adjustable Front Caster Rod Monoball Bushings (Part #SPL CRB E9X) are designed to replace the soft, deflection-prone OEM rubber caster rod bushings found on BMW performance chassis. By upgrading to large-diameter FK PTFE-lined spherical bearings, these bushings maintain precise suspension geometry under braking and cornering while significantly improving steering feel and front-end feedback.
CNC-machined offset spacers allow caster adjustment at the bushing level, giving alignment tuners another powerful tool to dial in front grip, camber gain, and straight-line stability without relying solely on camber plates or control arms.
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Brand: SPL Parts
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Part Number: SPL CRB E9X
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Position: Front
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Component Type: Adjustable front caster rod monoball bushings
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Adjustment Range: Up to +/- 4 degrees of caster via offset spacers
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Bearing: FK Racing 1-inch PTFE-lined spherical bearings
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Housing: CNC-machined 6061-T6 aluminum with outer knurl
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Function: Eliminates bushing deflection and reduces suspension friction
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OEM Arms: Not included (uses factory caster rods)
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Sold As: Pair
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Manufacturing: Made in the USA
Performance Benefits
- Eliminates rubber bushing deflection under load
- Maintains consistent suspension geometry during braking and cornering
- Improves steering feel and front-end feedback
- Adds caster adjustability without changing control arms
- Enhances camber gain and straight-line stability
Massive 1-inch FK spherical bearings feature self-lubricating PTFE liners for quiet operation, smooth articulation, and long service life in both street and track environments.
Construction & Materials
- 6061-T6 aluminum bearing housings with outer knurl
- 6061-T6 aluminum offset spacers for caster adjustment
- FK 1-inch PTFE-lined spherical bearings
Vehicle Fitment
- BMW E9X 3 Series M and non-M (2006-2013)
- BMW E8X 1 Series M and non-M (2008+)
- BMW F80 M3 (2014+)
- BMW F82 / F83 M4 (2014+)
- BMW F87 M2 (2016+)