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Add Real Caster To Your Z4 Or Supra For Sharper Steering Feel
The BMW Z4 and Toyota GR Supra share a front suspension design with a compliant front radius arm bushing that limits how much caster correction you can dial in. This Whiteline KCA495 front radius arm lower bushing kit uses a dual offset design to increase static caster and dynamic negative camber gain, sharpening steering feel and improving straight line stability.
Key Features
- Increases static caster and dynamic negative camber gain for sharper turn in
- Dual offset bushing design delivers more steering weight and precision
- Improves braking performance and reduces under load alignment change
- Firmer than the factory bushing for a more connected steering feel
- Direct bolt in replacement at the factory front radius arm mounting point
- KCA495 shares the same front radius arm design across the Z4 G29 and GR Supra A90 platforms
Fitment
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2019-2025 | BMW | Z4 | sDrive30i |
| 2020-2025 | BMW | Z4 | M40i |
| 2020-2026 | Toyota | GR Supra | Base |
| 2020-2026 | Toyota | GR Supra | Premium |
Specifications
| Detail | Value |
|---|---|
| Manufacturer | Whiteline |
| MPN | KCA495 |
| UPC | 9319924463954 |
| Position | Front |
| Application | Radius Arm Lower Bushing Kit |
| Benefit | Increased Caster and Negative Camber Gain |
| Kit Contents | Shell Bushings and Tubes |
What's Included
- Front radius arm lower dual offset caster bushing kit
- Required hardware for installation
About Whiteline
Whiteline designs and manufactures suspension components engineered to sharpen handling while preserving daily drivability. Their caster and camber correction kits, control arms, and bushing sets use proprietary synthetic elastomers and precision engineered geometry to correct factory suspension compliance and unlock more consistent, predictable handling.
FAQ
What is the KCA495?The KCA495 is a Whiteline front radius arm lower bushing kit for the BMW Z4 and Toyota GR Supra that increases static caster and dynamic negative camber gain using a dual offset design.
What benefit does more caster provide?Increased caster improves straight line stability and steering self centering while adding dynamic negative camber under cornering load for better grip.
Does this kit affect braking performance?Yes, the firmer bushing design reduces suspension compliance under load, which Whiteline notes improves braking performance and alignment retention.
Do I need an alignment after installing this kit?Yes, a full front end alignment is recommended after installation since the kit changes caster and camber characteristics.
Is this the same kit as the KCA497?No, the KCA495 targets caster and negative camber gain at the front radius arm, while the KCA497 is a separate front lower control arm bushing kit focused on camber adjustment.
Can I install this kit in my home garage?Yes, most installers with basic hand tools and jack stands can complete this bushing swap, though a proper alignment afterward requires shop equipment.
Will this kit work with lowering springs or coilovers?Yes, this kit is commonly installed alongside lowering springs or coilovers to help correct alignment characteristics that shift with a lower ride height.
Is this kit front or rear specific?This kit is for the front radius arm lower position only and does not include any rear suspension components.
Install Instructions
- Raise and safely support the front of the vehicle on jack stands
- Remove the front radius arm from its chassis and control arm mounting points
- Press out the factory bushing from the radius arm
- Install the new Whiteline dual offset bushing into the radius arm
- Reinstall the radius arm and torque all fasteners to factory specification
- Lower the vehicle and have a professional alignment performed
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