HPI Savage 21 Alloy Shock Body by GPM SAV13170/SB  [SAV13170/SB]

Alloy shock body for Savage 21

This is an RC-scale alloy shock body produced by GPM for the HPI Savage 21 platform, supplied as the aftermarket replacement part SAV13170/SB. The component replaces the plastic or worn aluminium shock cylinder in Savage 21 shocks and is intended for use inside the vehicle's suspension assemblies only.

The body is described as machined aluminium to provide a stiffer cylinder wall and improved heat dissipation compared with common plastic bodies. As an aftermarket shock body it serves two primary roles: restoring worn shock housings and offering a consistent platform for tuning shock oil and internal components to influence damping response.

Installation is a standard shock service procedure for RC models: remove the shock from the suspension arm, disassemble the shock cap and shaft assembly, transfer or replace internal parts as required, fit the new alloy body, then reassemble and refill with the chosen shock oil. Check O-rings and seals for fit and replace if necessary to avoid leaks. After reassembly, verify stroke and leakage at low speed before full running.

For tuning considerations, alloy bodies can change heat transfer and structural stiffness compared with plastic bodies; expect a difference in temperature behaviour under prolonged runs and a possible change in damping feel when combined with the same internal shim stack and oil. Confirm fitment to Savage 21 mounting interfaces before committing to race use.