This front coil spring suits HPI Savage 21 builds and is specified at 1.6mm wire diameter for compatibility with 115mm long dampers. The item is supplied as shown and is intended for replacing worn springs or changing spring rates during setup work on Savage 21 models.
Fitting is carried out with standard shock maintenance: remove the shock from the vehicle, strip the cap and shaft, remove the old spring, fit the replacement coil to the shock body or perch, then reassemble and verify travel and preload. After installation, tweak ride height and damping to achieve the desired handling balance.
For tuners, the 1.6mm wire and length match to 115mm dampers gives a reliable spring rate useful when tuning front-end support and overall handling on HPI Savage 21 vehicles.
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