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 In order to get the chainstays as short as I could while still having clearance for the fattest tires possible (short of 29+ etc etc), I had to bend the seat tube. However, I also wanted to run a dropper post, which are only really available in 30.9 diameter and up. Given those constraints, I did not have the ability to bend my thin walled large diameter tubing precisely, so I cut the tube and effectively bent it by putting in a sort of "pivot". It worked well and did not require any fancy tooling or processes.
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 Once I already had the "pivot" in the seat tube, I carried on the visual theme of intersected circles to the seatstay junction. Mostly I thought it looked cool.
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 Because who doesn't love a fillet brazed gusset.
 Once I completed the bike, I ran into problems with chainring clearance on the outside of the very wide s-curved chainstays. In order to clear a wider variety of chainrings, I cut out the portion of the chainstay closest to the bottom bracket shell and spliced in another stay flipped around, so that the bowed portion designed to clear a tire was now oriented inwards towards the tire. Plenty of clearance all around!
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