This Serpent 500911 item is an RC-scale front shock coil spring specified at 13mm diameter with a 4.1lbs rate in yellow, intended for front-shock tuning and small adjustments to suspension response.
Designed as a direct spring element, its role is to change ride frequency and initial compliance of a front suspension assembly. Use it when adjusting roll resistance, turn-in behaviour, or ride height via spring preload on compatible shock bodies.
Installation notes and setup tips:
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