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Bottom Bracket


PaRtZ

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A bracket fixes two things together (like the above photo) so fixing the cranks to the axle it's like a bracket.

A headset being a set of separate bearings and cups at the head seems more obviously named.

I assume this reasoning is correct :rolleyes:

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Always used to have the seat there so has always been called a seat tube.

If you look sideways at a frame it is like a quadrilateral - top tube, down tube, chain stay and seat stay, then without the seat tube the frame would flex a lot. The seat tube stops that happening, so you could call the seat tube a bracing member, like in steel buildings.

If you had a square shape made of steel beams and pushed on one corner then it would deform, but putting in diagonal beams connecting the opposite corners (so is a square with a cross in the middle) then that stops it happening. Like in a frame the seat tube stops the top half of the bike squashing down.

I vote for just calling it a seat tube!

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