https://www.bike-components.de/en/Shimano/BB-ES51-Octalink-Bottom-Bracket-p3803/
Shimano BB-ES51 Octalink Bottom Bracket: Versatile for MTB and Tiagra cranks, available in 68 mm and 73 mm widths with various axle lengths. | bike-components
bottom bracketbike componentsshimanobboctalink