KA and CR
KA is a coeficient used in the formula that calculates air resistance:
Source Bicycling Science:
0.368 Roadster, Utility bicycle
0.245 Sports bicycle
0.182 Road racing bicycle
Another source gives:
0.17 for a rider tucked into an aero position.
K
A varies from 0.1 to 0.4.
CR is a coeficient used in the formula that calculates rolling resistance:
Source Bicycling Science:
0.008 Roadster, Utility bicycle
0.0053 Default quoted by many authorities.
0.004 Sports bicycle
0.003 Road racing bicycle
C
R varies from 0.0025 to 0.008.
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