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May 15 at 17:57 comment added FreeMan Man, this is a long way of saying "physics". +100
May 15 at 5:25 comment added david I can affirm that the top tube also resists torsional forces on the bottom tube. When a tube tore on my step-through, it ripped, and the front and back twisted/rotated back and forth as it tore.
May 15 at 1:15 comment added Paŭlo Ebermann I always thought the roof is there so I don't get wet when it rains.
May 14 at 4:22 vote accept Gorka
May 13 at 21:47 comment added Berend +1 for the drawings
May 13 at 20:47 history edited Warren Burton CC BY-SA 4.0
added 91 characters in body
May 13 at 20:31 history answered Warren Burton CC BY-SA 4.0