This hub is an aftermarket replacement made for KYOSHO FW05-R and FW05RR on-road models and is identified as FW05-RR008. By cutting rotating mass at the clutch interface it produces a more immediate engagement and cleaner throttle transitions.
Manufactured to match FW05-R/FW05RR clutch dimensions and mounting points, the hub requires verification of spline alignment and shoe clearance before final tightening. Apply threadlock only when recommended by the clutch assembly maker.
In setup work the lighter hub shifts slip versus grip balance, allowing finer adjustment of launch behaviour and mid-corner throttle reapplication. Make measured changes and record results alongside spring and shoe compound variations.
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