>two (2) top tubes For what purpose?

In olden times, because steel was shit and so were welds

In modern times because light bikes are for racing freds and old shit is better because it sucks more and shit that sucks is like more real or something, nobody needs that do you think this is a race? Lol

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>>1050953
They are popular in the Netherlands, i brought one of them home with me to Sydney and its complete fucking cancer trying to ride a double top tube 30 KG fixie up a 11% gradiant

t. KankerAustralis

>>1050952
To strengthen the frame, obviously. You don't really need it unless you're using the bike for daily hauling work, but some people like the look.

>>1050952
>>1050953
To expand on "in olden times":

On a bike with a very tall headtube, the main triangle of the frame isn't really a "triangle" anymore, and can get fairly flexy which results in high stresses at the welds. A simple (but heavy) way to resolve this is to complete the main triangle further down.

Any modern bike you see constructed this way is done for hipster retro-style reasons (*cough* Rivendell *cough*), or to compensate for inadequate construction techniques. Often both.

Carrying pigs, of course.

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>>1051039
This

>>1050952
Because it could support a gas tank