This equivalent mass is the mass of a non rotating object that would oppose the same resistance to acceleration. We have made the calculation and tabulated the values. This piece of information is of particular interest to those who intend to use the wheels for criterium racing. In criterium racing, reaccelerating corner after a corner is what wears the riders down. Finally, we measured both lateral and radial stiffness of the wheels.
Lateral stiffness is a good thing.
A laterally stiff wheel feels better in a sprint. Radial stiffness, however, is less desirable. Soft wheels provide a more comfortable ride. 200 Four wheels that sprinters might want to avoid are the Shamal, Cosmic, Specialized and Zipp. Thirty-six 14 gauge spokes sure make a wheel stiff, and so does a very deep carbon fiber rim as on the Zipp.