Description
SPL Parts 2020+ Toyota GR Supra (A90) / 2019+ BMW Z4 (G29) Front Caster Rod Bushings (Non-Adj) is a chassis-specific suspension upgrade engineered for drivers who want more precise geometry control from 2020+ Toyota GR Supra (A90) / 2019+ BMW Z4 (G29) Front. SPL Parts is a U.S.-based performance-suspension specialist that develops motorsport-oriented chassis hardware for precise alignment, low compliance, and repeatable setup changes.
This front longitudinal link is designed to reduce bushing deflection and, where the application allows, provide additional caster or wheel-position adjustment. Controlling the fore-aft location of the upright improves how consistently the front suspension maintains geometry under braking and cornering load. Additional caster can increase dynamic negative camber as steering angle builds, improving outside-front tire support and steering feel while a lower-compliance pivot sharpens brake response and initial turn-in.
Why it matters: On this application, the goal is to keep the tire and upright closer to the intended alignment as loads rise, giving the driver a more repeatable platform for braking, turn-in, mid-corner balance, and power application. It is particularly useful when ride height, wheel/tire package, or track alignment targets require more geometry control than the OE arm can provide.
When combined with quality dampers and tires, precise suspension links help make chassis tuning changes easier to feel, measure, and reproduce.