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Shimano SMBH90 Olive & Insert 2.1mm bore single represents a precision hydraulic brake component engineered for demanding cycling applications. This OEM-specification olive and insert assembly features a 2.1mm bore diameter, delivering reliable fluid dynamics and consistent braking performance across varied terrain and weather conditions. The SMBH90 is compatible with Shimano's hydraulic disc brake systems, making it an essential replacement or upgrade component for riders seeking to maintain or enhance their braking reliability. Ideal for mechanics and enthusiasts performing brake maintenance or system rebuilds, this single unit ensures authentic Shimano engineering and durability standards.