Shimano Square Type Cartridge Bottom Bracket SB7S1
Shimano Square Type Cartridge Bottom Bracket SB7S1, SHIMANO SQUARE TYPE CARTRIDGE BOTTOM BRACKETFEATURESShimano quality/performance cartridge bearing square bottom bracketBetter chainline stability with chain line stabilizer3 structures availableStandard, E-type, chain case optionsAdapter material: Aluminum