External BSA Bottom BracketsDescription White Industries external BSA style bottom brackets are made in their shop with U. S. sourced 6061 T6 aluminum and feature Enduro stainless steel bearings or Enduro XD 15 ceramic bearings where available. They offer them with three different bearing sizes to help you fit your favorite crank to your favorite bike. BSA bottom bracket shells and cups are named after the Birmingham Small Arms Company which created the thread standard used in
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