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Utilization of natural fiber can be used as an automotive component product with structural and composite strength that is in accordance with ASTM standards. The purpose of this study is to measure bending, tensile, and microstructure using Scanning Electron Microscopy (SEM) as an analysis of the composite structure between rubber composites made from ramie reinforced and banana fibers with latex. The material use is agro fiber form banana tree and ramie, mixing with latex. The Variation are 10%, 20% and 30% reinforce,and latex start from 70% to 90%. Mechanical Properties of Composite Strengthened Rubber Ramie Fiber and Banana Fiber with latex used for sample prototype replacement Automotive Rubber Installation (Synthetic rubber). This research method is by making samples according to ASTM with each of 3 specimen samples in each fiber composition and rubber composite, a total of 30 specimen samples. 15 specimens were subjected to tensile tests, 15 bending test specimens and specimens with optimal results in each composite composition were subjected to SEM tests. The results of this research are expected that the material properties of each variation of the composite can be used according to load requirements.