Rubicon Express RXT Twin-Tube Shock Absorber – RXT2421B

Overview

The Rubicon Express RXT2421B is an RXT twin-tube gas charged shock absorber with a 24.5-inch extended length, a 14.5-inch collapsed length and a 10-inch stroke. It is built for on-road and off-road use.

The shock has a 1.625-inch piston for control and an 11/16-inch chrome shaft, which Rubicon Express says is used for maximum strength. Its oversized body holds more fluid, and double welded rings add durability.

Key features

• Twin-tube design
• Gas charged body
• 1.625-inch piston
• 11/16-inch chrome shaft
• Oversized body with more fluid capacity
• Double welded rings
• Stem and eyelet mounts

Shock tuning and wear

A shock absorber controls how quickly the suspension moves after a bump, which helps keep the tires in contact with the ground. A twin-tube design uses a working cylinder and a reserve chamber, and a gas charge helps limit foaming when the shock heats up. On an off-road vehicle, that heat control matters because long descents and repeated hits work the shock hard.

When replacing shocks, it is common to change a pair on the same axle so both sides damp evenly. Mounting hardware and bushings are often inspected at the same time, since worn eyelet bushings can make a new shock feel loose. Check that the stem and eyelet fittings are clean and that the shock sits without binding at full compression and extension.

Signs a shock is wearing out include fluid leaking from the body, a bouncy ride after bumps, cupping on the tires and a clunk over washboard roads. Inspect the shaft for dents or scoring, since damage there can tear the seal. Keep the shaft clean to protect the seal.

Specifications

Vehicle fitment

The shock uses stem and eyelet mounts, a 24.5-inch extended length and a 14.5-inch collapsed length. Measure your current shock to compare these figures.

Confirm fit for your vehicle’s year, model and trim before ordering.

What’s included

One RXT twin-tube shock absorber.