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Lukas
hippy
Depends on the yaw angle. Flat is likely to be better at ~0° simply because of the smaller projected area. Once you add a bit of crosswind, the lenticular ones can start acting as sails and generate enough lift to make the resultant force on the bicycle act forwards; it's not strictly a free lunch as the other component is a large sideways push which has to be resisted by some slip angle at the tyre, which adds rolling resistance, but that's likely to be worse with a flat disc too, as it will tend to stall much sooner.