From everything I've been able to read lately, toroidal profiled rims appear to give good aero benefits without the downside of being blown around in crosswinds. It also appears that the aero profiles seem to outweigh the benefit you'd get from a lower weight rim. Am I missing something?
you do. very much. Don't trust marketing and claims from manufacturers, be aware cycling forums ( including this one ) are full of paid content too.
to make long story short, your 1st statement is completely wrong , 2nd one not accurate.
V shaped rims are much better performers in both areas ( reducing drag at every yaw and lighter ).
I asked here many times for RELIABLE DATA
which will prove I'm wrong... never get it. Zipp funny claims and comparisons are not data, reliability I won't even comment ( comparing apples to peers.. totoaly f---d protocol, any student wouldn't pass to next year for that ). All the rest are just claims. No data.
Find some aero/hydro-nautic forum, read for a while ( it will take a lot of time, but fascinating knowledge ) and make own conclusion. Those forums are full of engineers who make a ( very decent ) living on "cheating" wind; and they do not want to sell you anything, nor are paid to "help" you making decision (99.9% of population simply can't afford stuff which they work on ).
PS my knowledge about aero profiles comes from engineer with 25y+ experience in aeronautics ( can't name companies he works for, however there's not to many in that field, isn't it
? ), privately building racing boats & designing sails.
Aero benefits can outperform weight in certain conditions, which are very difficult to achieve ( considered as "extremies : very heavy but very aero wheels vs very light and non aero at all ). Best would be compromise ; as light and as aero as possible.
I saw somewhere veery complicated calculation.. conclusion was that below 1.8 % of a system weight ( rider + bike ) there's not any particular gain, so wheels should be ( ideally ) kept on/under this weight limit and as much aero as possible ( profile, amount of spokes ( notice I didn't wrote SHAPE of spokes ! ) .
No idea was it accurate or not, but just someones idea...
Another topic are hubs. Some have better performance than others
At the end, check how much REALLY aero set matters in other situations than TT
Overall, your thought to go higher profile( Cf faired ) set with alu track is very reasonable if you want clincher rim braked set. Are full CF wheelsets without brake heat issues, but require quiet significant budget. Here "there's no free lunch" applies more than ever.
Interesting, perhaps I wasn't as precise with some language, and perhaps my conclusions aren't quite all there.
1) From the material I've read, a V shaped rim appears to be faster in situations in which there is no cross wind
2) In situations where there is a crosswind, the toroidal or U shaped rims are claimed to provide smoother airflow, such that riders don't get blown around as much.
Between those two points, what the marketers at wheel companies would like you to believe is that in sum total, not being blown around as much is worth it at the cost of slightly worse straightline performance. From what I've seen written about these types of wheels from both reviews and posters on forums is that this claim may be plausible. It's difficult for me to know how much the placebo effect plays into anyone's evaluation of a wheel, and I understand that reviewers are often biased.
I've read some other stuff from FLO cycling and others that suggests that most of the time, riders encounter yaw angles under 10 degrees.
How much of that do you agree/disagree with?
Some questions -
For me, not getting pushed around in a crosswind is a pretty desirable trait, is there any reading material you can link to me showing that other wheel shapes perform more or less similarly?
I'll admit that when I've looked at FLO cycling's data, over the course of an ironman they expect you might save 4 minutes with a wheel. That's a number I could see myself caring about if I was in competition, but not otherwise.
At the end of the day, I'm wondering if I should save myself the money and just order a set of Zondas