KYB SR4021 Strut-Plus Complete Corner Strut, Mount & Spring Assembly

The KYB SR4021 Strut-Plus is a complete corner unit assembly that combines an OE-restoring strut, coil spring, and mount into a single, ready-to-install package. Engineered by KYB — a globally recognized original equipment supplier — this assembly is designed to restore your vehicle's ride height, handling precision, and overall stability to factory specifications.

A strut assembly plays a critical role in vehicle dynamics: it supports vehicle weight, determines ride height, acts as the steering pivot point, and directly influences electronic stability and crash avoidance systems. The KYB Strut-Plus is engineered to address all of these functions simultaneously, making it one of the most comprehensive suspension restoration solutions available.

Key Features:

• OE-Restoring KYB Strut: Built to original equipment standards by a supplier to major vehicle manufacturers worldwide
• High Carbon Steel Coil Spring: Engineered using vehicle-specific attributes and corner weights to restore ride height within OE specifications
• Pre-Assembled Complete Unit: Includes strut, coil spring, and upper mount — no spring compressor required for installation
• Restores Ride Height: Calibrated to return the vehicle to its original ride height and handling geometry
• Supports Electronic Safety Systems: Proper strut function helps maintain calibration of ABS, ESC, and other crash avoidance technologies
• Reduced Labor Time: All-in-one assembly simplifies installation and eliminates the need for separate component sourcing

The KYB SR4021 Strut-Plus is ideal for technicians and DIY installers looking to perform a thorough suspension restoration with confidence. By replacing the strut, spring, and mount as a complete corner unit, you ensure all critical components are matched and restored to OE performance levels simultaneously.