Bilstein 25-331790 B8 5165 Universal Remote Reservoir Shock 24.4" Ext 14.6" Coll

Vehicle Fitment

• Universal fit - designed for custom-built and modified light trucks and SUVs
• No direct OEM vehicle-specific fitment - this shock is sold by travel length and valve rate to accommodate a wide range of custom suspension builds
• Builder must verify shock length, travel, and mounting configuration compatibility with their specific application before purchase

Fitment Notes

• Extended length of 24.39 in and collapsed length of 14.61 in must match the available shock mounting distance of the intended application
• Both upper and lower mounts are Eye-to-Eye with standard 5/8 in hourglass bushings - verify mounting hardware compatibility before installation
• Valving code 255/70: optimized for medium-duty off-road applications in light trucks and SUVs; compression-biased tuning provides controlled body motion over demanding terrain
• Reservoir hose routing must be planned prior to installation - 360° swivel banjo fitting allows flexible positioning
• Optional billet aluminum reservoir clamp (Bilstein Part #11-176015) available separately for a cleaner, more secure reservoir mount
• Sold individually - order quantity needed for your build

Features

• Bilstein B8 5165 Series remote reservoir shock absorber - purpose-built for custom off-road vehicles where direct-fit shocks are unavailable or insufficient for the build
• 46mm monotube high gas pressure design delivers consistent, fade-free damping performance across all terrain types and driving conditions
• Remote reservoir dramatically increases shock oil capacity for substantially greater heat dissipation and sustained damping sensitivity during extended off-road use
• Floating dividing piston located inside the reservoir - removes any internal limitation on piston travel, allowing for greater wheel travel and shaft movement than conventional designs
• Bilstein's patented self-adjusting deflective disc valving reacts instantly to changing surface conditions, providing maximum vehicle control at any speed
• 360° swivel banjo hose fitting connects the shock body to the remote reservoir, enabling clean, low-profile routing in virtually any installation orientation
• Standard 5/8 in hourglass bushings on both upper and lower eye mounts for broad hardware compatibility across custom builds
• Bilstein Triple-C Technology® zinc-plated finish provides easy care and long-lasting corrosion resistance in harsh off-road environments
• Reservoir mounting kit and installation instructions included
• Available in multiple lengths and valve rates to accommodate a broad range of custom suspension configurations

Specifications

• Part Number: 25-331790
• Series: B8 5165
• Type: Universal Custom-Fit Remote Reservoir Shock Absorber
• Body Diameter: 46mm Monotube
• Extended Length: 24.39 in (619.5 mm)
• Collapsed Length: 14.61 in (371.1 mm)
• Travel: 9.78 in (248.4 mm)
• Valving: 255/70
• Upper Mount: Eye, 5/8 in with Hourglass Bushing
• Lower Mount: Eye, 5/8 in with Hourglass Bushing
• Mount Type: Eye-to-Eye
• Reservoir: Remote, with 360° Swivel Banjo Hose Fitting
• Finish: Zinc Plated (Triple-C Technology®)
• Adjustable Damping: Non-Adjustable
• Spring Seat Included: No
• Quantity: 1 shock absorber per package
• Warranty: 90-Day Limited

Included Components

• 1x Bilstein B8 5165 Remote Reservoir Shock Absorber (25-331790)
• 1x Remote Reservoir with 360° Swivel Banjo Hose Fitting
• 1x Reservoir Mounting Kit (brackets and hardware)
• 1x Installation Instructions

Product Description

The Bilstein 25-331790 is a B8 5165 Series universal remote reservoir shock absorber, designed for custom-built and modified light trucks and SUVs where vehicle-specific direct-fit shocks are either unavailable or insufficient for the builder's application. Unlike Bilstein's B8 5100, 5160, or 8100 series shocks that are tuned and sized for specific vehicle platforms, the B8 5165 is sold by travel length and valve rate, making it the correct choice for long-travel builds, swapped suspension systems, custom link setups, and other specialty applications that fall outside standard OEM or lifted-truck fitment ranges. At 24.39 inches extended and 14.61 inches collapsed - providing 9.78 inches of travel - this specific unit suits a variety of mid-travel custom rear or front suspension configurations on light trucks and SUVs.

At the core of the 25-331790 is Bilstein's proven 46mm monotube design, pressurized with high gas pressure nitrogen for consistent, fade-free damping under repeated impacts. The self-adjusting deflective disc valving with a 255/70 tune reacts immediately to surface changes, balancing compression control on rough terrain with sufficient rebound compliance for a composed ride. The remote reservoir significantly increases oil volume beyond what the shock body alone can hold, which directly improves heat management during sustained high-intensity off-road use - a critical factor for builds that operate at or near the limits of wheel travel for extended periods. The floating dividing piston, housed inside the reservoir rather than the shock body, eliminates any internal travel limitation and maximizes usable shaft stroke for maximum wheel travel potential.

Installation is flexible thanks to the 360° swivel banjo hose fitting, which allows the reservoir hose to be routed cleanly in virtually any direction to suit the constraints of the builder's chassis. Standard 5/8 in hourglass bushings on both upper and lower eye mounts provide broad hardware compatibility. A reservoir mounting kit with brackets and hardware is included. For a cleaner, more rigid reservoir installation, Bilstein's optional billet aluminum reservoir clamp (Part #11-176015) is available separately. Builders should measure their available shock mounting distance carefully and confirm both extended and collapsed lengths are appropriate for their suspension geometry before ordering. This shock is sold individually and backed by a 90-Day Limited Warranty.