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Do UCI rules prohibit airways within the frame? Could take high-pressure air from near the headtube and duct it back behind the seatpost...
By implication, kind of. The regulatory model is solid, a duct makes the thickness of the regulated solid the wall thickness of the duct, 25mm minimum. Not that it matters, because the drag in the duct would be so high that it would cancel out any relief of high pressure on the nose cone or filling of low pressure behind the seat tube.
gbj_tester
Do UCI rules prohibit airways within the frame? Could take high-pressure air from near the headtube and duct it back behind the seatpost...