This replacement bearing is intended to occupy the rear upper-deck mounting position, securing the deck and increasing torsional stiffness for competitive hobby use on BD11-family and MSR-compatible chassis.
Boosting stiffness at the upper-deck rear helps control rear deflection under corner loads, often leading to a more neutral and predictable turn-in on surfaces where the rear previously hooked. As a tuning item, its impact varies with suspension settings and track conditions.
Replace the existing rear upper-deck bearing with this unit and confirm fit with the supported models. When testing, adjust other settings progressively so the influence of this part on handling is clear.
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