This steel brake disk is supplied as a direct RC replacement for the HPI Savage 21 chassis and is sized for straightforward swap-in use on models that reference the Savage 21 layout.
Installation overview: remove the wheel and original rotor, fit the steel disk in the same orientation as the factory part, then resecure the hub fasteners to the manufacturer's recommended fitment. After installation, inspect rotor runout and brake pad alignment before running the model.
Tuning role and durability: steel construction produces predictable wear patterns that help with routine servicing and brake feel adjustments. Check the rotor periodically for scoring or uneven wear and replace as part of normal RC brake system maintenance.
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