This GPM aftermarket set provides front and rear upper arms designed for the HPI Savage 21 platform, supplied as a single pair intended for RC-scale replacement and setup work. The assembly uses Alloy-7075 for the main arm bodies and includes a titanium tire rod plus the necessary screws and a hex wrench for basic fitting.
Functionally these parts replace the factory upper arms and act directly in the suspension geometry and steering linkage path. Swapping to Alloy-7075 arms and a titanium tire rod can affect durability and stiffness at the mounting points, which in turn influences handling balance during tuning and track use. Check existing mounting hardware and ball bearings for fit before final installation.
Installation notes: the package includes screws and a hex wrench for on-chassis fitting, so basic assembly can be completed without sourcing additional small tools. Verify thread engagement and keep fasteners secure after initial runs; periodic checks during break-in and after heavy bashing runs are recommended.
Use this set when replacing worn plastic arms or when testing a stiffer arm option for tuning; confirm fitment on your Savage 21 before committing to long-run use.
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