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Ir/H-SSZ-13 catalysts were used for methylcyclopentane (MCP) ring-opening (RO) reaction, and exhibit higher yields to RO products than H-ZSM-5, H-USY and Al 2 O 3 supported Ir catalysts. Ir species supported on H-SSZ-13-A (about 200 nm) exhibits higher activity than those on H-SSZ-13-B (about 8 μm) due to its more accessible acid sites. Ir/H-SSZ-13-A gives higher reactivity than Ir/Al 2 O 3 , especially in the case of low Ir loading because of the promotion of the strong acid sites located on the external surface of H-SSZ-13-A. This work demonstrates that SSZ-13 supported metal is a potential catalyst for RO reaction. [Display omitted] • Ir/H-SSZ-13 was used as catalyst for methylcyclopentane (MCP) ring-opening (RO) reaction. • Ir/H-SSZ-13 shows a higher yield to RO products than ZSM-5, USY and Al 2 O 3 supported Ir catalysts. • The acid sites on the external surface of SSZ-13 promote the activity of the supported Ir species. • This work expands the application range of SSZ-13. [ABSTRACT FROM AUTHOR]