Description
The Kinematic Designs Front Roll Center & Bumpsteer Correction Kit (RCBS) is a precision-machined solution for lowered BMWs and Supras that restores proper suspension geometry by correcting both roll center and bump steer with OEM components.
The kit includes two types of shims:
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Roll center spacers that install between the front knuckle and lower control arm
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Bump steer spacers that install between the front knuckle and tie rod
Together, they optimize suspension kinematics, reduce camber loss, minimize steering deflection over bumps, and improve body control—all without altering spring rates, sway bars, or alignment specs beyond toe.
Key Benefits:
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Improves front roll center geometry on lowered vehicles
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Reduces bump steer, making the car more stable over rough surfaces
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Improves camber curve, reducing the need for extreme static camber (e.g., -4°+)
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Improves kinematic resistance to roll, meaning less body roll without stiffer springs
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Better tire wear and improved braking grip due to reduced camber loss
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Maintains OEM reliability using OEM arms and tie rods
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Installs in under an hour with basic hand tools (requires an alignment)
Each shim is machined for OE fitment, providing 8mm of correction—the most possible while staying within safe thread engagement on factory components.
Whether you're building a weekend canyon carver, dual-purpose track build, or simply want your lowered street car to drive better, this kit is an affordable, highly effective upgrade.
Note: Alignment required after installation. For maximum performance and adjustability, hardcore track setups may benefit from fully adjustable aftermarket arms.
Vehicle Fitment:
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E8X / E9X Non-M, E9X M3, and 1M
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F8X M2, M3, M4
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F2X / F3X Non-M and M Sport
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G8X M2, M3, M4
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G4X / G2X Non-M and M Sport
A90 Toyota Supra
(with OEM front control arms and tie rods)
