This component, part number FW05-RR008, is an aftermarket replacement intended for KYOSHO FW05-R and FW05RR clutch assemblies. It reduces rotating mass at the clutch interface to improve engagement sharpness and throttle response under transition loads.
The hub is produced to reproduce FW05-R/FW05RR mounting points and spline layout. During installation confirm spline seating and shoe clearance, and follow torque recommendations. Use threadlocker only where specified by the clutch assembly producer.
From a setup perspective the reduced inertia modifies slip versus grab characteristics; tune spring rates and shoe compounds in controlled increments and record telemetry or lap times to quantify changes. Standard workshop practice for run-in and break-in applies.