The Optio spring set is an aftermarket replacement produced by 3Racing for use on TAMIYA TT-01 Type-E variants identified as TT01-14/LB/V2. These springs are installed into the standard shock absorbers to alter stiffness and allow ride height trimming.
Installation is straightforward: remove the shock from the suspension, compress the spring with the threaded collar if available, swap the springs, then reassemble. You only need common RC maintenance tools like a hex driver and pliers; no special tooling is required.
Spring changes influence roll characteristics and weight transfer; for balanced handling match spring choices with appropriate shock oil and adjust preload. Always test new setups on a small circuit and check that springs are seated correctly on the retainer after fitting.
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