SPL Parts adjustable front caster rod bushings for the 2021+ BMW M3 and M4 (G8X). Replaces the soft factory rubber bushing with a 1in PTFE-lined FK spherical bearing in a CNC-machined 6061-T6 aluminum housing, eliminating deflection and bind to hold geometry and sharpen response. Offset spacers provide +/-2 degrees of caster adjustment. Sold as a pair, made in the USA; OEM arms not included.
| Type | Adjustable front caster rod bushings |
| Bearing | 1in FK spherical, PTFE-lined |
| Housing | CNC 6061-T6 aluminum |
| Adjustment | +/-2 deg caster |
| Quantity | Pair |
| Origin | Made in USA |
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2021-2023,2025 | BMW | M3 | Base |
| 2021-2023,2025 | BMW | M3 | Competition |
| 2022-2023,2025 | BMW | M3 | Competition xDrive |
| 2021-2026 | BMW | M4 | Base |
| 2021-2026 | BMW | M4 | Competition |
| 2022-2026 | BMW | M4 | Competition xDrive |
| 2025 | BMW | M4 | CS |
| 2023 | BMW | M4 | CSL |
