Shimano BOTTOM BRACKET, BB-UN300, SPINDLE: SQUARE TYPE, SHELL: BSA 68MM, SPINDLE: 115MM (D-H), W/FIXING BOLT

Square Type Bottom Bracket - MTB FEATURES SHIMANO quality/performance cartridge bearing square bottom bracket Better chainline stability with chain line stabilizer 3 structures available Standard, E-type, chain case options Adapter material: Alum