HPI Savage 21/Savage 25 40 Series Tire Insert by 3Racing HSA-033  [HSA-033]

40 Series tire insert for Savage 21/25

This 3Racing HSA-033 tire insert is a scale accessory designed for RC use with HPI Savage 21 and Savage 25 models. Supplied as one pair, it fits 40 Series tires and is intended to sit between the wheel bead and the tyre carcass to stabilise the tyre profile during cornering and high-load maneuvers on off-road surfaces.

Compatibility focuses on the Savage 21 and Savage 25 chassis running 40 Series tyres, so installation follows the standard tyre-mount workflow: remove the tyre from the rim, position the insert evenly around the rim seat, then remount and glue or clip the tyre per your wheel system. For foam or multi-density tyre setups, check tyre seating before final glue to avoid pinching the insert.

In tuning terms the insert's role is to maintain bead support and reduce tyre rolling under lateral load, which affects traction and steering feel. Adjust tyre pressures (air or foam compression) and tyre choice in conjunction with the insert to dial steering response and mid-corner grip for practice or club racing environments.