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Bilstein Monotube Rod Shocks Apart

From this angle, the difference in piston size is obvious. The Bilstein's piston area, about 36 mm (1.42 inches) for a steel-bodied shock, is almost twice the size of the twin-tube's one-inch diameter; you can see how that gives them more valving area. Notice how no plates cover the outside diameter. Bilstein uses that area for its oil passages, but we'll get to that later.
Bilstein's Monotube Rod Shocks - Tech - Custom Classic Trucks

 From this angle, the difference in piston size is obvious. The Bilstein's piston area, about 36 mm (1.42 inches) for a steel-bodied shock, is almost twice the size of the twin-tube's one-inch diameter; you can see how that gives them more valving area. Notice how no plates cover the outside diameter. Bilstein uses that area for its oil passages, but we'll get to that later.  View Related Article

 

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