I would go for the zipp 808 firecrest due to its shape.It has a toroidal u shape which is wider in the middle like a fish were as the Reynolds is more of a v shape.Both would be good in a direct head wind but the zipp will perform much better when the wind is gusting and coming at an angle(like it does most of the time).
The Reynolds Aero 90 every time. Way easier to handle in crosswinds. In regards to overall aero performance, there isn't much in it (at higher yaw the Reynolds will be faster just because it's more controllable). If you were looking for a low yaw wheel, the original H3 or non-FC 808 would be quicker.
The Element is a solid flat disc (used to have one), but not the pinnacle of wheel tech. Keep in mind that frame design plays a huge role in whether a flat or lenticular disc (or even a deep rear) will be faster. Also, at low yaw a disc will always be faster.
In all honesty, my TT position and fitness need work before differing performance in wheelsets comes into play! It's purely down to vanity and bling which I'm not ashamed to admit.
At zero yaw narrow and low watts to spin is key which is why the H3 is king. In regards to the Aero 90 vs. the 808 FC, read the executive summary on the RZR92 (effectively the same wheel) and you'll see there's not much in it. The fact that the Aero is infinitely easier to control in crosswinds and has proven hubs makes it a better choice. As far as data is concerned, I'm not at liberty to share mine.
Hmmm interesting...I've always coveted a set of Aeros, either 90s for my TT bike or 72s for my road bike. Unfortunately I've never had the opportunity to try any and they don't come up for sale very often. What you say agrees with what I have heard though, especially with regard their handling characteristics in windy conditions. They seem to be a bit of a overlooked/neglected choice really. I shall keen dreaming for now...
The zipp wheel would not get past the brake pads on my tt bike will they on yours.
I have a zipp 808 FC which fits into my TT bike very snugly. I did have to modify the rear brake in order to get a reasonable pull on the brake lever but it wasn't too much of an issue. They front wheel has a standard caliper so that's fine.
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just my thoughts and other opinions are available
ABCC Cycling Coach
ABCC Cycling Coach
You'd never get it back!
ABCC Cycling Coach
Interestingly, Reynolds rate their Aero 90 and RZR rear wheels as more aero than their Element disc wheel.
ABCC Cycling Coach
What's your reasoning there out of interest? Or maybe you have some data that shows the Aero 90 to be quicker?
ABCC Cycling Coach
http://www.reynoldscycling.com/uploads/RZR_Executive_Summary_rev1.pdf
The zipp wheel would not get past the brake pads on my tt bike will they on yours.
I have a zipp 808 FC which fits into my TT bike very snugly. I did have to modify the rear brake in order to get a reasonable pull on the brake lever but it wasn't too much of an issue. They front wheel has a standard caliper so that's fine.