This KYB suspension spring (part code RA4139) is meticulously engineered to match the specifications of your vehicle's original equipment. It is designed to restore the factory ride height and provide the intended suspension geometry, ensuring optimal handling and comfort. Crafted from high-quality materials, this spring undergoes rigorous testing to guarantee its durability and resistance to fatigue. Whether you are replacing a worn-out spring or upgrading your suspension, the KYB RA4139 offers a reliable solution for maintaining your vehicle's performance and safety. Properly functioning suspension springs are crucial for absorbing road imperfections, maintaining tire contact with the road, and ensuring stable vehicle dynamics. The KYB RA4139 is built to deliver consistent performance over time, providing a smooth and controlled driving experience.