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I think the major upgrade to the latest record Todd Reichert, riding the ETA was that there is no window and the rider uses a camera to see forward and that gave a smaller cda (about .012 m^2):
Edit: the previous record was also a camera bike but it has side windows if the camera fails. I think allowing cameras is a newish addition to the rules.
Would be interesting toknow the power output of the various riders during these attempts.
Presumably the majority of the improvements are down to aerodynamic gains, but I wonder how much is attributable to stronger, better trained riders?