Upgrade Your TRX-4 with These High Performance Shock ...
From the factory, TRX-4 models' shocks are filled with 30-weight silicone oil. For reduced damping force and more responsive axle articulation, fill the shock with lower-viscosity ('thinner') shock oil, such as 20-25 weight. Follow these steps to fill the shock: Refill the shocks with 20-25wt. oil.
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