KYB 553239 Shock Absorber - Rear

Overview of KYB Gas-a-just Suspension Shock Absorber 553239

The KYB Gas-a-just shock absorber 553239 is engineered for precise suspension performance on select BMW models. Designed to restore original handling and ride quality, this shock absorber suits BMW 318i, 318is, 320i, 323Ci, 323i, 323is, 325Ci, 325i, 325is, 328Ci, 328i, 328is, 330Ci, and 330i vehicles.

• Compressed length: 14.76 inches
• Extended length: 23.97 inches
• Stroke length: 9.21 inches
• Lower mount type: E2 (12x41)
• Upper mount type: S1
• Includes R-stop but no B-stop
• No dust cover or internal rebound spring included

About the KYB Gas-a-just Product Line

The Gas-a-just line from KYB offers gas-charged shock absorbers designed to provide consistent damping performance and improved vehicle control. This product line focuses on delivering a balance between comfort and handling, making it suitable for BMW models requiring reliable suspension components that maintain factory specifications.

Detailed Product Description

The KYB Gas-a-just shock absorber 553239 features a compressed length of 14.76 inches and an extended length of 23.97 inches, providing a stroke length of 9.21 inches. The lower mount uses an E2 (12x41) configuration, while the upper mount is type S1, ensuring proper fitment and secure installation on compatible BMW models. This shock absorber includes an R-stop to limit rebound travel but does not have a B-stop or internal rebound spring, which aligns with the original equipment design for the specified vehicles. The absence of a dust cover means the shock relies on the vehicle’s existing protection to maintain durability.

Common Applications and Problem Solving

• Restores suspension performance on BMW 3 Series models including 318i, 320i, and 330i
• Addresses excessive bouncing or poor ride quality
• Reduces body roll and improves handling stability
• Eliminates noise or harshness caused by worn shocks
• Helps maintain proper tire contact and vehicle control

Installation Notes and Tips

When installing the KYB Gas-a-just shock absorber 553239, ensure the correct orientation of the E2 lower mount and S1 upper mount for secure fitment. Verify the R-stop is properly engaged to prevent overextension during rebound. Since this shock does not include a dust cover, inspect the vehicle’s existing suspension components for wear or damage before installation. Professional installation is recommended to maintain suspension alignment and safety.

Quality Assurance and Warranty

KYB manufactures the Gas-a-just shock absorbers to meet or exceed OEM standards for durability and performance. The part number 553239 undergoes rigorous quality control to ensure consistent damping characteristics. KYB typically offers a limited warranty on their shock absorbers; please refer to KYB’s official warranty documentation for specific coverage details.