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 |
| Position | Front |
| Bearing | 1in FK spherical, PTFE-lined |
| Adjustment | +/-2 deg caster |
| Housing | CNC 6061-T6 aluminum |
| Quantity | Pair |
| Part Number | SPL CRB G8X |
| 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 |
Shipping: In-stock orders placed before 3 PM EST ship the same day, and everything else ships within 24 hours. Standard, expedited, and overnight options are available at checkout. Backordered items ship as soon as we get them back in stock. Contact us for lead times. See the full Shipping Policy.
Returns: 30-day returns on new, unused items in original packaging. See the full Refund Policy.
