Shimano BB-UN300 bottom bracket

The UN300 is a JIS square taper bottom bracket featuring sealed cartridge bearings, steel cups and a hollow cro-mo steel spindle.

Available in 107mm & 110mm lengths.

• 68mm English-threaded (BSA)

• JIS square-taper

• spindle length: 107mm, 110mm

• crank arm bolts not included

• requires Park Tool BBT-22 for installation & removal