I'm guessing the former is a Shimano Octalink, which was used with the Shimano Deore LX crank.
The latter, a Shimano square taper, used with the Bianchi crank. I think.
One is ITA the other BSA. Am I right in thinking I can replace these with two new Shimano versions? So (unnecessarily) complicated.
Yes, BB standards are a whole world of fun. You can just get a new one of each BB, square taper and octalink, with ITA or BSA threads as required. Make sure to check the spindle lengths.
Both the Bianchi and the mad Stars and Stripes bike are amazing by the way!
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