The HSA-001/1 graphite side chassis is a scale replacement designed for HPI Savage 21 and Savage 25 platforms. It installs to the original rail points and provides a firmer structural side panel than common stamped or plastic originals.
For setup work the stiffer panel reduces unwanted twist during acceleration and impacts, which can stabilise steering input and suspension behaviour. Switching to a graphite side chassis will change how the truck balances, so check droop and anti-squat values after fitting.
Mount using the factory attachment points on Savage rails and confirm all fasteners and bearing positions before running to prevent binding. This unit is sold as one piece for RC use only.
A good upgrade for drivers who want a firmer chassis platform to refine handling and tuning on Savage 21/25 trucks.
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