This is an RC-scale 70.0mm center universal bone intended for the rear side of the center drive of YZ-4SF chassis. Machined from a lightweight 70-75 hardness aluminum alloy, the part reduces rotating mass compared with standard steel components which can help refine throttle feel and lessen drivetrain load during runs.
Use this component when you need a direct replacement for the center universal on the specified chassis. The part is dimensioned for the center drive location and intended to be installed in place of the factory piece without modifying the drivetrain geometry. As with all metal upgrades, check clearances, fastener torque, and driveshaft alignment after installation to avoid premature wear elsewhere in the drivetrain.
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