Whiteline Performance Sway Bar 18mm Adjustable – 2020-2024 Toyota Supra

Tune the Rear Balance on Your A90 Supra
The Whiteline BTR99Z is an 18mm 3-point adjustable rear sway bar for the 2020-2024 Toyota Supra (A90). The A90 platform is shared with the BMW Z4, and its rear suspension is capable of excellent handling with the right calibration. Whiteline’s rear bar provides adjustable roll stiffness tuning to complement whatever front bar and spring setup you’re running, allowing you to dial in a neutral handling balance suited to your use case.

DETAILS

• 18mm 3-point blade adjustable rear sway bar
• Solid spring steel, silver powder coat
• Includes polyurethane mount bushings and hardware
• 3 adjustment positions for tunable rear roll stiffness
• Fits 2020-2024 Toyota Supra A90
• Direct bolt-on installation

A90 Supra Rear Suspension Calibration
The A90 Supra arrived with competent but conservative rear suspension calibration. The rear bar sizing tends toward understeer protection — appropriate for a broad range of drivers but limiting for enthusiast use where corner entry rotation is desirable. Whiteline’s 18mm adjustable rear bar provides meaningful stiffness increase over the OEM unit with the flexibility to tune between three positions.

Blade Adjustability for System Tuning
The three-position adjustment allows matching the rear bar stiffness to your front setup and driving preference. For balanced road and track use, a middle position typically works well. For more aggressive corner entry rotation, move to the stiffer setting and confirm the front bar calibration supports the balance.

Complement With the Whiteline Front Bar
Whiteline also produces a front sway bar for the A90 Supra. Running matched Whiteline bars front and rear with the BTR99Z allows you to tune the complete roll stiffness distribution — the most effective way to calibrate handling balance on any platform.

Why Choose Whiteline

Whiteline has been engineering suspension components from their facility in Australia since 1979. Every product in their catalog is developed with a clear goal: measurable improvement in handling, stability, and tyre contact. Whiteline’s polyurethane bushings, sway bars, control arms, and alignment correction kits are engineered using finite element analysis and validated on track before they reach the market. Their components are direct-fit, bolt-on solutions designed for enthusiasts who want real performance gains without fabrication or custom work.

The RallySport Take

A well-engineered rear bar for the A90 Supra. The 3-position adjustability makes it useful across a range of setups and driving styles, and the Whiteline build quality is appropriate for a car of this caliber. Installation is a straightforward bar swap — remove the OEM bar, install the Whiteline unit with the provided polyurethane mount bushings, connect the endlinks. Start in the middle adjustment position and move from there. Adjustable endlinks are a worthwhile companion purchase if the car has been lowered, ensuring the bar operates at zero preload at the new ride height.

What’s in the Box

• 18mm 3-point blade adjustable rear sway bar
• Solid spring steel, silver powder coat
• Includes polyurethane mount bushings and hardware
• 3 adjustment positions for tunable rear roll stiffness

Fitment