Fitment Information
- BMW 230i / M240i G42 (2022, 2023, 2024, 2025, 2026)
- Fits xDrive (AWD) and sDrive (RWD)
- We limit the above applications to known fitments from testing and research. If you're unsure if this is the proper part for your application, send us an email.
- Occasionally, parts will fit other vehicles not listed above. If you believe, or know, this part will fit your vehicle, send us an email and we'll work with you to confirm proper fitment.
Specs & Features
- Adjustable Caster
- Eliminates Bushing Deflection and Bind
- Major Improvement to Steering and Braking Feel
- Reduces Wheel Hop
- 6061-T6 Billet Aluminum Bushing
- FK USA PTFE-lined Spherical Bearing
- Zinc Plated Steel Snap Rings
- Made in USA
Product Description
The SPL Adjustable Front Caster Rod Spherical Bushings for the BMW G42 platform replace the large, squishy hydraulic OEM bushing with an adjustable spherical bearing to greatly enhance the front handling and braking performance, as well as reducing front wheelhop on xDrive model BMWs.
Caster Adjustment
Set the Ideal Caster for Better Lateral Grip
Caster angle is critical to a MacPherson strut front suspension because it increases the amount of camber that is gained as steering angle is increased. It also improves the centering torque on the steering wheel for straight line stability and additional tire feedback. The result is better grip mid-corner and an improvement to peak braking by slightly reducing the need for static camber.
Adjustable caster also allows you to adjust the wheel location (side view) to prevent tire rub with the front bumper, or fender in some cases.
Eliminates Bushing Deflection
No More Sloppy Steering and Squishy Brakes
The OEM caster rod bushing is a huge, hydraulic bushing that prioritizes comfort at the expense of performance. Under braking, steering, or acceleration load the bushing will deflect significantly, leading to a rubbery steering and braking feel and an unwanted change in bumpsteer.
Reduces Wheel Hop
Avoids Hammering the Drivetrain
On xDrive models, a hard launch on grippy tires results in the front wheels suddenly loading the caster rod. This results in caster rod bushing deflection which allows the unsprung mass (wheel, tire, etc) to lurch forward. This movement generates inertia (energy) that is poorly dampened, resulting in a rebound force that feeds into the tire and can initiate wheel hop or tire spin.
Eliminates Bushing Bind
Less Bind, More Control
Load transfer under acceleration, braking, or cornering results in the rotation of the caster rod bushing. The OEM bushing generates significant amounts of bushing bind, limiting the droop travel, and acting as a rubber spring, actively resisting suspension movements and releasing that stored energy. Upgrading to a spherical bushing eliminates this bushing bind, and allows the suspension to properly articulate without generating additional unwanted forces.
Noise, Vibration, and Harshness (NVH)
Product NVH Rating
The caster arm bushings are an active part of NVH control strategy for the front suspension. The trade-off for performance is additional NVH over rough roads, particularly hard bumps, a small increase in road / tire noise, and a greater likelihood of tramlining for some setups. However, the ride quality on smoother roads, even with some rolling bumps, will be improved over stock due to the elimination of bushing bind. Going to a high-quality coilover with suitable spring rates will further enhance this improvement and mitigate some of the NVH impact.
Replaces OEM Part Number(s)
This is a list of known OEM part numbers. OEMs constantly make changes to part numbers due to part updates, suppliers, etc so this may not be a complete list.
31106894675 (Bushing)
31106894676 (Bushing)
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.More in this category
BMW 2 Series Parts
BMW 230i Parts
BMW M240i Parts
SPL Parts Bushings
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Actual item may vary from picture