This RC-scale Optio spring set is a replacement/upgraded spring kit produced by 3Racing for use with TAMIYA TT-01 Type-E chassis variants listed as TT01-14/LB/V2. It serves as a direct replacement for shock springs and is intended to be used in the model's standard shock absorbers to alter suspension response and trim ride height.
Compatibility is limited to the chassis codes specified in the product name. When preparing to install, remove the shock from the suspension assembly, decompress the spring with the shock threaded collar if present, then swap the existing spring for the Optio unit and reassemble. Basic hand tools and a hex driver are sufficient for the swap, no special machining is required.
In tuning terms this spring set is used to influence body roll, pitch, and weight transfer on the RC chassis; pair spring changes with appropriate shock oil and preload adjustments to achieve predictable handling. Always test on a safe, small-scale layout and inspect for correct seating on the shock retainer after installation.
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