The SPL CRB G29 Adjustable Front Caster Rod Monoball Bushings replace the factory rubber caster rod bushings on the 2020+ Toyota GR Supra and 2019+ BMW Z4 with massive 1-inch FK Racing spherical bearings housed in precision-machined 6061-T6 aluminum. Rubber bushings allow the front suspension geometry to deflect under hard braking and cornering, degrading steering feel and brake response. The SPL CRB G29 eliminates that compliance entirely. The CNC-machined offset bearing spacers unlock plus or minus 4 degrees of caster adjustment, allowing performance-oriented alignment settings not achievable with the OEM rubber setup. OEM tension rods are retained; only the bushing hardware is replaced.
| Year | Make | Model | Trim |
|---|---|---|---|
| 2019 | BMW | Z4 | sDrive30i |
| 2020 | BMW | Z4 | sDrive30i |
| 2021 | BMW | Z4 | sDrive30i |
| 2022 | BMW | Z4 | sDrive30i |
| 2023 | BMW | Z4 | sDrive30i |
| 2024 | BMW | Z4 | sDrive30i |
| 2020 | BMW | Z4 | M40i First Edition |
| 2020 | BMW | Z4 | sDrive M40i |
| 2021 | BMW | Z4 | sDrive M40i |
| 2022 | BMW | Z4 | M40i |
| 2023 | BMW | Z4 | M40i |
| 2024 | BMW | Z4 | M40i |
| 2023 | Toyota | GR Supra | A91-MT Edition |
| 2020 | Toyota | GR Supra | Base |
| 2021 | Toyota | GR Supra | Base |
| 2022 | Toyota | GR Supra | Base |
| 2023 | Toyota | GR Supra | Base |
| 2020 | Toyota | GR Supra | Launch Edition |
| 2020 | Toyota | GR Supra | Premium |
| 2021 | Toyota | GR Supra | Premium |
| 2022 | Toyota | GR Supra | Premium |
| 2023 | Toyota | GR Supra | Premium |
| Specification | Detail |
|---|---|
| Part Number | SPL CRB G29 |
| UPC | N/A |
| Material | 6061-T6 Aluminum bearing housing with outer knurl |
| Rod End Type | 1-inch FK Racing Spherical Bearing with PTFE/Teflon liner |
| Adjustment Range | +/- 4 degrees of caster adjustment via CNC-machined offset spacers |
| Thread Pitch | Press-fit into OEM caster rod; chassis fastener per OEM specification |
| Quantity | Pair (2 bushings + offset spacers) |
| Warranty | 1-Year Limited Warranty |
What exactly does the SPL CRB G29 replace on my GR Supra or Z4?
The SPL CRB G29 replaces only the rubber bushing at the chassis-side attachment of the front caster/tension rod. The OEM caster rod arm itself is not replaced. Installation is a bushing swap using a press.
How much caster adjustment does the SPL CRB G29 provide?
The CNC-machined offset spacers allow plus or minus 4 degrees of caster adjustment from the baseline position. This range allows dialing in additional positive caster for improved steering feel and high-speed stability on both stock and lowered vehicles.
Will the FK spherical bearings increase road noise in my GR Supra or Z4?
The PTFE-lined FK bearings are engineered to minimize NVH. The Teflon liner is self-lubricating and self-cleaning, providing quiet operation. Most users report no significant increase in road noise compared to OEM rubber bushings.
Is a press required for installation?
Yes. The SPL CRB G29 bearing housing is pressed into the OEM caster rod end. A hydraulic shop press is required. Installation by a qualified shop is strongly recommended.
When does a vehicle need this product?
The SPL CRB G29 is beneficial on any GR Supra or Z4 where improved braking feedback and sharper front end response are desired. It becomes especially useful on lowered or track-driven vehicles where caster adjustment is needed to compensate for changed geometry.
Are these compatible with SPL front lower control arms and other SPL front suspension components?
Yes. The SPL CRB G29 is designed to complement other SPL suspension upgrades on the G29 platform. SPL specifically recommends the CRB G29 alongside aftermarket front lower control arms that may require additional caster clearance.
Will installing the SPL CRB G29 void my GR Supra or Z4 factory warranty?
Under the Magnuson-Moss Warranty Act, your vehicle manufacturer cannot void your entire warranty simply because an aftermarket part was installed. They must demonstrate that the specific aftermarket component caused the failure in question. Consult your dealer for your specific situation.
What is the operating temperature range of the FK bearings?
FK spherical bearings with PTFE liners are rated for continuous service in both extreme cold and sustained high-temperature environments, making them well suited for track and motorsport applications.
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