Bilstein B8 5125 Shock Absorber 20.77 Eye/Eye Zinc-Plated Monotube

The Bilstein B8 5125 is built for custom suspension work — situations where a direct-fit Bilstein application doesn't exist and you need a shock you can spec to your build. This is a 46mm monotube unit with high gas pressure internals, a 14mm shaft, and self-adjusting deflective disc valving that responds to changing surface conditions without manual input.

The specs here are worth knowing before you build. Collapsed length is 20.77 inches, extended length is 34.91 inches, and stroke travel is 14.14 inches — numbers that matter when you're calculating clearance and travel on a custom setup. Compression is rated at 620 and rebound at 2495 (both at 52 m/s). Mount configuration is eye/eye with 5/8-inch hourglass bushings at both ends. No reservoir, smooth body, non-coilover.

The zinc-plated finish handles exposure without adding coatings that can complicate fitment in tight applications. This shock is sold individually, so order accordingly for your build.

We stock this for builders who know exactly what they need and don't want to compromise on internal construction. Bilstein's monotube design — no foam, no oil/gas mix — means consistent damping under heat. The 90-day limited warranty applies. If you're running a custom long-travel or fabricated suspension setup and need a known-spec shock to dial it in, this is a solid foundation.