Bottom Bracket

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La Scatola del Movimento Centrale

It is the conjunction of the top tube, seat stays and chain stay. It consists of a cylinder with threaded ends that can be of two types: Italian or English.
The thickness is hearty enough to withstand the efforts. It can have different dimensions depending on the type of bicycle, and even the thread type can change.

Sources:

http://www.cyclinside.it/web/category/componenti/

http://www.albanesi.it/corsa/ciclismo.htm