I know this post may set this discussion off in a different direction, but so far all the data provided compares the Zipp 808/858 against the last generation of 808/858. However, for me, the new 808 (in particular) has some appeal as a crit racer. In the past, I would not have considered the 808, as I would have felt that the added weight of the 808 over some of the competitive 50mm wheels out on the market, would offset any aero gains on the deeper profile.
The 808 firecrests appear to be in the same weight range as many 50mm/60mm on the market (Roval CL’s that come on the Tarmac SL7 Pro/Ultegra build, old 404’s, HED RC6, etc.)
I’m more curious if two wheels are the same weight, what are the aero gains from an 80mm rim over a 50-60mm rim, given the same tire/tube/pressure setup?
Is it a meaningful upgrade in crit racing, say, or is it going to just be a watt or two gained, and maybe a little more weight towards the edge of the wheel, making it a bit slower to accellerate out of corners?