The preprint by Defraeye et al discuss plenty of details related to the aerodynamics of bicycles, and has a fantastic list of references recent up to 2010.
Among these references, a 1983 Scientific American article is particularly interesting. (Gross, A.C., Kyle, C.R., Malewicki, D.J., 1983. The aerodynamics of human-powered land vehicles. Scientific American 249 (6), 142-15) This diagram suggests that 60-70% of aerodynamic drag is attributed to the rider's body, and aerodynamic drag is attributed to approximately 90% of the total losses in the system.
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