Bilstein 25-284591 Suspension Shock Absorber - Rear Right

Bilstein B8 8100 (Bypass) Shock Absorber Overview

The Bilstein B8 8100 (Bypass) shock absorber, part number 25-284591, is engineered for Lexus and Toyota SUVs including the 4Runner, GX460, and GX470. Designed to enhance suspension performance, this shock absorber offers precise control through its double adjustable damping system.

• Double adjustable damping for compression and rebound
• Bypass body design (non-coilover) with 60mm diameter
• Monotube internal design with integrated reservoir
• Zinc plated finish for corrosion resistance
• Collapsed length: 14.72 inches (374 mm), extended length: 24.09 inches (612 mm)
• Lower mount: 19.3mm eye, upper mount: stem
• Compatible with Lexus 4Runner, GX460, GX470

Detailed Features of the B8 8100 (Bypass) Shock Absorber

The Bilstein B8 8100 (Bypass) series is designed to provide advanced suspension tuning through its double adjustable damping system, allowing independent adjustment of compression and rebound. This feature enables drivers to fine-tune their vehicle’s handling characteristics for varying road conditions and driving styles. The bypass body design, which is non-coilover, incorporates a monotube internal structure with an integrated reservoir to improve heat dissipation and maintain consistent performance under demanding conditions.

With a 60mm body diameter, this shock absorber balances durability and responsiveness. The zinc plated finish offers protection against corrosion, extending the service life of the component. The shock’s dimensions—14.72 inches collapsed and 24.09 inches extended—ensure proper fitment and travel for the specified Lexus and Toyota models. Mounting is facilitated by a 19.3mm eye at the lower end and a stem at the upper end, matching factory specifications.

About the Bilstein B8 8100 (Bypass) Product Line

The B8 8100 (Bypass) product line from Bilstein focuses on providing adjustable suspension solutions that enhance off-road and on-road performance. Unlike coilover shocks, the bypass body design allows for precise damping adjustments without altering spring rates, making it suitable for vehicles like the Lexus 4Runner, GX460, and GX470 that require robust and adaptable suspension components. This line is engineered to deliver consistent handling and improved ride quality across a range of driving conditions.

Applications and Problem Solving

• Improves handling and stability on rough or uneven terrain
• Reduces body roll and enhances cornering control
• Minimizes shock fade during extended off-road use
• Restores suspension performance on worn or factory shocks
• Allows customization of ride comfort and responsiveness

Installation Notes and Tips

Ensure compatibility with Lexus 4Runner, GX460, and GX470 models before installation. Verify mounting points match the 19.3mm eye lower mount and stem upper mount specifications. Adjust damping settings gradually to find the optimal balance between compression and rebound for your driving conditions. Professional installation is recommended to maintain suspension integrity and safety.

Quality Assurance and Warranty

Bilstein shock absorbers, including part number 25-284591, are manufactured to meet strict quality standards with durable materials and precision engineering. The zinc plated finish provides corrosion resistance for extended service life. Warranty details should be confirmed with the manufacturer or authorized distributor to ensure coverage terms.