You might visualize sitting in this...sproing. I suppose it's true that road vibration would take the long way round, but I don't know. Why compromise the structure of the tried and true road-going furniture, when you can isolate with a modern/correct selection of foam for the saddle and not upset your seat height, or frame stability.

And aerodynamics seem to be coming up as a roost, with rider aboard that is. What's up front eg. Canyon, Scott etc. is most significant. The seat tube allows for battery, a flow splitter and management out the back end. I see no compelling reason to delete it, other than to look different or cool. BRG nice color tho! PS: Who's riding it? Look at those bars!

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