EVS RS9 Hinge Extension Stop Trees deliver customizable joint articulation control, hyperextension prevention, and factory-level mechanical tuning, engineered specifically for EVS RS9 knee braces. Designed as a genuine OEM replacement and tuning component, this molded stop tree supplies graduated lockout stops that allow riders, racers, and medical trainers to precisely calibrate maximum leg extension, protecting delicate knee ligaments against violent hyperextension during severe impacts or hard landings.