Bilstein 25-187885 B8 5165 Remote Reservoir 46mm Monotube Off-Road Suspension Shock Absorber

The Bilstein 25-187885 B8 5165 is a high-performance remote reservoir shock absorber engineered for custom off-road builds. Designed for lifted light trucks and SUVs, the B8 5165 series delivers race-inspired damping performance in a universal application, available in multiple lengths and valve rates to suit a wide variety of custom suspension setups.

At the core of the 25-187885 is Bilstein's proven 46mm monotube gas-pressure design, which keeps shock oil under pressure to prevent foaming under extreme heat and stress. The separate remote reservoir significantly increases fluid capacity for superior heat dissipation and fade-free damping — even during the most demanding off-road conditions. A floating dividing piston housed in the reservoir (rather than in the shock body) eliminates internal restrictions, allowing for greater piston travel and increased wheel travel compared to traditional monotube designs.

Key Features:

• 46mm monotube construction with high-pressure nitrogen gas charge for consistent, fade-free performance
• Remote reservoir increases oil capacity for enhanced heat dissipation and extended wheel travel
• 255/70 digressive valving for responsive, controlled damping across all terrain types
• 5/8-inch eyelet mounts with hourglass bushings on both ends for secure, flexible mounting
• 360-degree swivel banjo hose fitting on the reservoir line for clean, low-profile installation
• Zinc finish with multi-layer coating for maximum corrosion and impact resistance
• Collapsed length: 12.30 inches | Extended length: 19.72 inches | Travel: 7.5 inches
• Includes reservoir mounting kit and detailed installation instructions
• Sold individually

The Bilstein B8 5165 remote reservoir shock absorber is the ideal solution for off-road enthusiasts who demand superior damping control, durability, and maximum wheel travel from their custom-lifted truck or SUV. Backed by Bilstein's renowned monotube technology, MPN 25-187885 is built to handle the harshest environments mile after mile.