Shimano BB-UN300 bottom bracket
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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