This is an RC-scale replacement part intended to take the place of the bearing mounted at the rear of the upper deck to secure the upper deck and raise torsional stiffness. It is designed for hobby racing use on compatible BD11-family chassis and related MSR platforms.
By increasing rigidity at the upper-deck rear mount, the part helps the car resist rear deflection under corner load, which can produce a smoother, more neutral turn-in on surfaces where the rear tends to hook. The component is a tuning item rather than a core drivetrain element; its effect depends on chassis setup and track conditions.
Installation replaces the existing rear upper-deck bearing location and should be checked for fit against the listed supported models. Adjust other chassis settings progressively when evaluating handling change so the role of this part is clear in setup work.
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