This replacement spring is specified for use with the YRX12 2019 kingpin and coil-spring front suspension on 1/10 scale RC cars. The spring wire diameter is 0.50mm and the pack contains 2 pcs. It is intended to provide precise control of front-end steering preload and initial feel when the vehicle uses a kingpin-based front end.
In setup the spring alters the initial preload on the kingpin assembly, allowing small, controlled changes to steering response. When replacing, confirm the suspension matches the YRX12 2019 kingpin and coil spring layout and fit the spring in the same orientation as the original to preserve intended preload behavior.
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