SPL Parts BMW F2X/F3X xDrive AWD Front Thrust/Radius/Compression Arm Spherical Bushing Kit - Adjustable Caster Tension Strut/FLCA Uniball/Monoball Bearings - F22 F23 F30 F31 F32 F33 F36 2/3/4 Series Front Lower Control Arm Upgrade (CRB F3iX)

BMW F2X - F3X xDrive Front Thrust Arm Spherical Bush Kit by SPL

Transform the front axle feel of your AWD BMW with SPL’s CRB F3iX thrust arm bearing kit. By replacing the front lower control arm rubber bush with a motorsport-grade 1 inch FK PTFE-lined spherical joint, you get razor-sharp steering, confident braking and rock-solid geometry control on fast road and track day builds. Less flex, less bind, more precision.

This upgrade swaps the factory hydro bush for a solid, low-friction uniball that keeps alignment true under load. The included offset sleeves allow meaningful caster tuning at the hub, so you can dial in extra front-end bite and stability without compromising tyre wear. It is a proven, workshop-favourite solution for xDrive owners chasing crisp turn-in and repeatable handling.

Why choose this kit

• Immediate steering response and feedback on xDrive models
• Holds alignment during hard braking and cornering - no mushy rubber compliance
• Fine-tune front-end grip with real caster adjustment at the arm
• Low-friction spherical joint reduces stiction and bushing bind
• Track-capable durability with daily usability

Construction highlights

• CNC-machined 6061-T6 aluminium housings with knurled outer for a secure press fit
• Massive 1 inch FK spherical bearings with self-lubricating PTFE liners
• Offset spacers providing up to ±4 degrees of caster range
• Engineered for consistency, longevity and precise articulation
• Supplied as a pair - reuse your OEM arms
• Made in the USA

Fitment - xDrive only

For AWD BMW platforms only:

• F2X 2 Series xDrive
• F3X 3 Series and 4 Series xDrive

Note: Not suitable for rear-wheel-drive vehicles.

In the box

• 2 x SPL thrust arm spherical bush assemblies with FK bearings
• Offset spacers for caster adjustment

Workshop feedback

We have installed this SPL kit on multiple customer cars and the feedback is consistently excellent: cleaner turn-in, steadier braking and a more connected front end. A go-to upgrade for anyone serious about front axle precision on an AWD F2X - F3X BMW.

Installation and alignment

Professional fitting and a quality alignment are recommended. For UK installation, book with MJ Modifications in Warwickshire - request a quote at info@mjmodifications.co.uk.

Part number

SPL CRB F3iX

Brand

SPL Parts

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