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BB is a common acronym for a Bottom Bracket.
Task Summary
When installing all Bottom Brackets, ensure that the correct frame preparation is completed. This may involve Tapping and/or Facing the shell .
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Topics 
Bottom Brackets (BBs) 09: Installing a new BB Unit Open/Loose Bearing Type
Bottom Brackets (BBs) 09: Installing a new BB Unit Open/Loose Bearing Type
Open/Loose Bearing Type
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