Bilstein 8125 Series 39.5in Extended Length 23.5in Collapsed Length 46mm Monotube Shock Absorber

Bilstein is well-known for making solid suspension components that perform reliably, and their B8 8125 series coilovers are a prime example. This particular shock absorber, part number 33-225586, is built for custom off-road suspension setups where you need robust performance and adjustability. It measures 39.5 inches when fully extended and 23.5 inches when collapsed, offering a substantial amount of travel for tackling rough terrain.

What sets these coilovers apart is the integrated remote reservoir. This reservoir holds extra fluid, which helps dissipate heat more effectively. This means you get consistent, fade-free performance even when you're pushing your vehicle hard in demanding off-road conditions. The 46mm monotube design also contributes to this consistent damping. The body itself is threaded, allowing for easy adjustments to ride height and spring preload, which is crucial when fine-tuning your suspension for a specific application. Bilstein also incorporates a competition-designed, 3-stage seal pack to keep contaminants out and ensure durability in harsh environments. The piston rod is 22mm, hard-chromed, and case-hardened, giving it excellent strength and resistance to damage from rocks and sand.

These coilovers are designed to be rebuilt by the owner, and replacement parts are available directly from Bilstein, which is a big plus for long-term ownership. All components are machined to precise tolerances and made in the USA, ensuring a well-built product ready for serious off-road use. If you're building a custom suspension and need a shock absorber that can handle the heat and abuse of off-roading, this Bilstein 8125 series unit is a strong option.