
SPL PartsSKU: T14-SPPSPL RLCB E9X
SPL Parts Rear Lower Control Arm Knuckle Bushing - BMW 3/4 Series E9X/F3X/F8X
$152.10 Available
Ships from the brand or distributor, usually in 3–7 business days
Make sure this fits your car
Fits: BMW M240i (F22/F23), 340i (F30/F31), 440i (F32/F33/F36) (B58).
1
- Shipping at real carrier rates
- 30-day returns on unused parts
- Fitment help before you buy
The rear lower control arm meets the hub knuckle through a rubber bushing that flexes under load. SPL replaces it with a spherical bearing, so the rear wheel stays where it should under hard cornering and the arm moves freely through its travel.
What you get
- Teflon-lined spherical bearing in place of the factory rubber bushing.
- Housing machined from 6061-T6 aluminum.
- Less deflection under heavy load and less binding as the suspension moves.
- Sold as a pair.
Good to know
- This is the lower control arm knuckle bushing, not the rear traction arm knuckle bushing, which SPL sells separately.
Brand: SPL Parts · Part #: SPL RLCB E9X
Ships from the brand or distributor, usually in 3-7 business days.
BMW M240i (F22/F23), 340i (F30/F31), 440i (F32/F33/F36) (B58).
| Model | Chassis | Years | Engine | Fits |
|---|---|---|---|---|
| M140i | F20/F21 | 2016–2019 | Gen 1 B58 | |
| M240i | F22/F23 | 2016–2021 | Gen 1 B58 | |
| 340i | F30/F31/F34 | 2016–2019 | Gen 1 B58 | |
| 440i | F32/F33/F36 | 2017–2020 | Gen 1 B58 | |
| 540i | G30/G31 | 2017–2019 | Gen 1 B58 | |
| 740i | G11/G12 | 2016–2019 | Gen 1 B58 | |
| X3 M40i | G01 | 2018–2019 | Gen 1 B58 | |
| X4 M40i | G02 | 2019 | Gen 1 B58 | |
| 640i GT | G32 | 2018–2019 | Gen 1 B58 | |
| M340i | G20/G21 | 2019–2024 | Gen 2 B58 (TU) | |
| M440i | G22/G23/G26 | 2021–2024 | Gen 2 B58 (TU) | |
| M240i | G42 | 2022–2024 | Gen 2 B58 (TU) | |
| Z4 M40i | G29 | 2019+ | Gen 2 B58 (TU) | |
| GR Supra 3.0 | A90/A91 | 2020+ | Gen 2 B58 (TU) | |
| 540i | G30/G31 | 2020–2023 | Gen 2 B58 (TU) | |
| 740i | G11/G12 | 2020–2022 | Gen 2 B58 (TU) | |
| X3 M40i | G01 | 2020+ | Gen 2 B58 (TU) | |
| X4 M40i | G02 | 2020+ | Gen 2 B58 (TU) | |
| X5 xDrive40i | G05 | 2019–2023 | Gen 2 B58 (TU) | |
| X6 xDrive40i | G06 | 2020–2023 | Gen 2 B58 (TU) | |
| X7 xDrive40i | G07 | 2019–2022 | Gen 2 B58 (TU) | |
| 840i | G14/G15/G16 | 2019+ | Gen 2 B58 (TU) | |
| INEOS Grenadier | Station Wagon/Quartermaster | 2023+ | Gen 2 B58 (TU) | |
| M340i | G20/G21 | 2025+ | Gen 3 B58 (48V) | |
| M440i | G22/G23/G26 | 2025+ | Gen 3 B58 (48V) | |
| M240i | G42 | 2025+ | Gen 3 B58 (48V) |
Not sure? Email sales@b58racing.com with your VIN.
- Ships from the brand or distributor, usually in 3–7 business days.
- Shipping is charged at the carrier's rate, shown at checkout. Orders over 70 lb ship by freight for a flat $99.
- Unused parts can be returned within 30 days. Some items are marked no-refund in their description.
Full details are on our shipping and returns page.
Guides for this part
Pairs well with

Whiteline
Whiteline Universal Swaybar Link Kit-Heavy Duty Adjustable 10mm Ball/Ball Style
Fits: 340i, 440i
$169.09Ships in 3–7 days

EBC
EBC brake Ultimax2 brake Pads
Fits: 340i, 440i
$79.29Ships in 3–7 days

KONI
Koni Special Active Shock FSD 12-17 BMW 2/3/4 Series RWD w/ M-Technik Susp Front
Fits: M240i, 340i, 440i
$327.35Ships in 3–7 days

Dinan
Dinan 14-21 BMW M235i/M240i (F22) Performance Spring Set
Fits: M240i
$313.95Ships in 3–7 days
