The Yokomo RP-102A Titanium Φ4.8 Kingpin Ball is intended to refine the BD9 front end. Machined from titanium for a favourable weight-to-strength ratio, it reduces mass at the upper pivot points to enhance steering accuracy and consistency during competitive running.
Using titanium for moving steering parts lowers inertia without compromising toughness. The RP-102A helps the front end respond faster to steering inputs, which can aid consistency lap after lap when setup is dialled in.
These kingpin balls are made to fit BD9 suspension geometry and install with the factory mounting arrangement. The reduced rotating mass supports steadier mid-corner behaviour and helps maintain tyre contact through quick direction changes.
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