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You are more than welcome to dissect it one it’s removed. It does look as though the crease occurred where the tube changes thickness, but as you say, the hole (I believe it’s for the cable guides, not dynamo routing) could also have been the weak spot.
@Hulsroy Yes, that tube is butted, although I can’t quite remember what series of Columbus it is.
Keeping 1 1/8 kinda limits fork options a bit but it means we won’t need to replace the hub and the headset. QR wheels and external headsets are totally fine for cruising about all day.
hollow__legs
Hulsroy
Great that she is ok and the frame took most of the impact.
Something that came to mind when looking at the photo of the downtube damage: I wonder if the dynamo routing hole played a part in focusing the failure at that location, and whether that relates to where the tube butting thickness changes? It might've interesting to see what the tube looks like cut in half longitudinally.