Bilstein 25-177473 B8 5165 Remote Reservoir 46mm Monotube Off-Road Suspension Shock Absorber

The Bilstein B8 5165 is a high-performance 46mm monotube remote reservoir shock absorber built for custom off-road trucks and SUVs. Engineered to handle the most demanding terrain, the B8 5165 delivers superior damping performance and durability well beyond what a conventional shock absorber can offer.

The external remote reservoir dramatically increases oil capacity, providing enhanced heat dissipation and damping sensitivity during extended off-road use. Because the floating dividing piston is relocated into the reservoir itself, the shock body gains additional shaft travel for greater wheel articulation. The result is improved control, reduced fade, and more consistent performance on rough terrain.

Key Features:

• 46mm monotube design with digressive piston and self-adjusting deflective disc valving for precise, responsive damping
• Remote reservoir increases oil capacity for superior heat dissipation and extended damping sensitivity
• 360-degree swivel banjo hose fitting connects the reservoir for flexible, low-profile routing and clean installation
• 5/8-inch eyelets with hourglass bushings on both upper and lower mounts for secure, rattle-free fitment
• Zinc-plated steel body with Bilstein's multi-layer Triple-C-Technology coating for long-term corrosion resistance
• Available in multiple travel lengths and valve rates to suit a wide range of custom build requirements
• Includes reservoir mounting hardware — all necessary washers, bushings, and nuts included; factory mounting bolts are reused
• Compatible with optional billet aluminum reservoir clamp (part #11-176015) for an even cleaner look

The B8 5165 series is sold individually and is intended for custom lifted truck and SUV builds where a universal-fit, high-performance reservoir shock is required. Backed by Bilstein's engineering heritage and manufactured to exacting standards, the 25-177473 is built to withstand the harshest off-road environments.