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Discussion Starter · #1 ·
Im looking to upgrade the shimano 2300 components that came on my sectuer. I plan on using this as a learning experience as to how bike components are installed and tuned.

Now the bike came with a un55 BB, this much I know. The question is, since I am buying a complete groupset, which type BB do i need? Will the BSA bb that comes with this Tiagra groupset work after removing the current un55?

Shimano Tiagra 4600 Groupset | Groupsets - Road Bike | Merlin Cycles

Thanks for the help!
Harry
 
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