https://www.ebay.co.uk/itm/Bahnrad-Fixed-Gear-Trackbike-cannondale-NJS-3Rensho-Hatta-Swan/302907575748?hash=item4686b2cdc4:g:TOEAAOSwOHpbcKF9
That's... an interesting design. What's the advantage of the extra tube at the back compared to just making the top tube and the seat stays go further up the seat tube?
What do we want? Rigidity! When do we want it? Triangles!
@SwissChap started
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https://www.ebay.co.uk/itm/Bahnrad-Fixed-Gear-Trackbike-cannondale-NJS-3Rensho-Hatta-Swan/302907575748?hash=item4686b2cdc4:g:TOEAAOSwOHpbcKF9