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The Bilstein 25-176124 is a B8 5165 Series remote reservoir monotube shock absorber engineered for custom off-road vehicles including lifted trucks and SUVs. The 25-176124 features a 9.5-inch stroke, 160/58 compression and rebound valving, 14.21-inch collapsed length, and 23.60-inch extended length, with 5/8-inch eyelet mounts on both ends for universal coilover and non-stock mounting location applications. The B8 5165 Series uses Bilstein's nitrogen-infused 46mm monotube design with a remote reservoir that dramatically increases oil capacity, heat dissipation, and wheel travel compared to a standard shock absorber body.
The 25-176124 remote reservoir is connected via a high-pressure 360-degree swivel banjo hose fitting that allows clean, low-profile installation in tight mounting configurations. The floating dividing piston is located inside the reservoir rather than the shock body, eliminating any restriction on piston travel for maximum wheel travel and shock sensitivity. Bilstein finishes the 25-176124 with a zinc-plated body for long-term corrosion resistance in off-road environments. A reservoir mounting kit is included in the box. The 25-176124 is sold individually and designed for custom applications where the builder specifies the correct shock length for their suspension geometry.
25-176124 Key Features
- B8 5165 Series remote reservoir monotube off-road shock absorber
- 46mm body diameter with 14mm piston shaft for maximum durability
- 9.5-inch stroke, 23.60-inch extended length, 14.21-inch collapsed length
- 160/58 valving configuration (compression/rebound)
- Remote reservoir dramatically increases oil capacity and heat dissipation
- Floating dividing piston in reservoir for maximum wheel travel
- 360-degree swivel banjo fitting for clean, flexible installation
- 5/8-inch eyelet mounts, top and bottom, with hourglass bushings
- Zinc-plated body finish for off-road corrosion resistance
- Reservoir mounting kit included
- Designed for custom non-stock shock mounting locations
Product Specifications
| Specification | Detail |
|---|---|
| Part Number | 25-176124 |
| Brand | Bilstein |
| Series | B8 5165 Remote Reservoir |
| Body Diameter | 46mm |
| Shaft Diameter | 14mm |
| Extended Length | 23.60 in (599.5mm) |
| Collapsed Length | 14.21 in (361.0mm) |
| Travel | 9.39 in (238.5mm) |
| Valving | 160/58 (Compression/Rebound) |
| Mount Type | Eye to Eye |
| Upper Mount | Eye 5/8 in with Hourglass Bushings |
| Lower Mount | Eye 5/8 in with Hourglass Bushings |
| Internal Design | Monotube, Non-Adjustable Valving |
| Reservoir | Yes, Remote with 360-Degree Swivel Banjo Fitting |
| Finish | Zinc Plated |
| Boot Included | No |
| Nitrogen Charged | Yes |
| Fitment | Universal, Custom Application |
| Warranty | Bilstein Limited Lifetime Warranty |
| UPC | 651860661155 |
What's Included
- 1x Bilstein 25-176124 B8 5165 remote reservoir shock absorber
- Reservoir mounting kit (bracket hardware)
Installation Notes
The 25-176124 is designed for custom non-stock mounting location applications on lifted trucks and SUVs. The builder is responsible for verifying that this shock length is correct for their specific suspension geometry before purchase. Collapsed and extended lengths must be verified against the actual suspension travel and mounting dimensions of the custom application. The reservoir can be positioned and secured using the included mounting kit. Bilstein recommends professional installation for custom off-road suspension builds.
Frequently Asked Questions
What is the Bilstein 25-176124 designed for?
The 25-176124 is a universal application B8 5165 Series remote reservoir shock designed for custom off-road vehicles, lifted trucks, and SUVs running non-stock mounting locations. It is sold by length and valving rate for builders who spec the correct shock length for their custom suspension geometry.
What is the difference between the 5160 and 5165 series?
The B8 5160 is designed for lifted trucks and SUVs using stock factory shock mounting locations. The 25-176124 belongs to the B8 5165 Series, which is designed for custom applications with non-stock mounting locations and greater variability in stroke and valving options. The 5165 offers a wider range of lengths and valve configurations for purpose-built off-road and competition setups.
Why does the 25-176124 have a remote reservoir?
The remote reservoir dramatically increases the total volume of shock oil in the system. More oil means greater capacity to absorb and dissipate heat generated during sustained off-road use, which prevents the fluid aeration and damping fade that limits the performance of standard body shocks in demanding terrain.
What does the floating dividing piston in the reservoir do?
Locating the dividing piston in the reservoir rather than the shock body removes all restrictions on piston travel within the shock itself, allowing the full bore of the 46mm body to serve as the working cylinder. This increases wheel travel and improves damping sensitivity across the full stroke.
Does the 25-176124 come with a reservoir mounting bracket?
Yes. A reservoir mounting kit is included with the 25-176124. An optional billet aluminum reservoir clamp (part number 11-176015) is available separately for a cleaner, more compact installation look.
Is the 25-176124 adjustable?
No. The 25-176124 uses non-adjustable valving. If adjustable damping is needed for the application, Bilstein's adjustable off-road shock series should be considered instead.
What is the warranty on the Bilstein 25-176124?
The 25-176124 is covered by Bilstein's limited lifetime warranty against defects in materials and workmanship. As a suspension component, the Magnuson-Moss Warranty Act provides federal consumer protections ensuring that the use of quality aftermarket parts does not void unrelated vehicle warranty coverage.
WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information visit www.P65Warnings.ca.gov.
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