Originally Posted by
gregf83
Not according to Zipp. They're essentially the same aerodynamically but the 202s are lighter.
What do you mean? What does "essentially the same aerodynamically" mean? What does Zipp say?
I looked at the 101 (now 30C) before I bought my last set of wheels, and I believe the 101s are not Zipp's premier Firecrest rim profile. The Zipp site says only the 202,303,404 and 808 use the Firecrest, which is "more aerodynamic than any other rim design." What that means, exactly, is unclear in terms of aero efficiency, but I'd be surprised if Zipp means the 101 and 202 are "essentially the same aerodynamically," but perhaps you have some other insight?
Also, the 202 is wider overall, bead to bead, and 2mm deeper than 101, so if rim shape affects aero performance, well, there's some reason to expect difference between those two.