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Perfomance difference between aero wheels & nons(14 posts)

Perfomance difference between aero wheels & nonsericdrum
Mar 19, 2003 7:57 AM
Aside from the cosmetic, what is the difference between aero wheels and the non aeros?
Depends on how hard I pedalNASA Noddler
Mar 19, 2003 9:32 AM
Aero wheels are annoying in crosswinds.PeterRider
Mar 19, 2003 9:41 AM
numbersDougSloan
Mar 19, 2003 9:52 AM
http://www.analyticcycling.com/WheelsConcept_Page.html

Aero wheels are almost always faster than non-aero, even if the aero wheels are heavier.

Doug
Weight vs. AerodynamicsKeeponTrekkin
Mar 19, 2003 10:04 AM
1st, the crosswinds complaint is valid;
2nd, the aerodynamic advantages are valid;
3rd, they are almost always heavier and rotating mass is worse than non-rotating.

Riding hills, most riders, particularly recreational, spend far more time climbing than coasting or cruising so the non-aero wheels are probably the better choice for them.

As a practical matter, non-aeros tend to be hi spoke count (e.g. 32) while aero's tend to be low spoke count (e.g. 16). Low spoke count looks cool but if you have a broken spoke out on a long ride, you're far more likely to be walking than with a hi spoke count wheel. Lo spoke count wheels are easier to keep clean.

Pay your money and take your choice. I own both.

KoT
What's more important? Spoke count or rim profile? (nm)PseuZQ
Mar 19, 2003 1:39 PM
they are usually linkedDougSloan
Mar 19, 2003 2:28 PM
Deep rims are stronger and need fewer spokes, so they are usually linked together.

Nonetheless, I swear my Nucleons are as fast as my Zipp 303's.

Doug
they are usually linkedpurplepaul
Mar 19, 2003 3:34 PM
Since the difference is claimed to be something like 1:40 minute over 40km for the deeper Zipp 404's, I doubt most people could discern any increase in speed. Also, keep in mind that unless you are riding by yourself, aero won't help you. It just so happens that some of the most aero wheels happen to be some of the lightest (but most expensive).
sureDougSloan
Mar 19, 2003 3:56 PM
When drafting, they certainly matter less. However, I assume that at some point you are going to be at or off the front, bridging, or even off the back (temporarily, of course). If you want to win, by definition you need to be in front, going at speeds when aerodynamics is most critical.

Zipp 303 or 404 tubulars are probably as close to ideal combination of weight and aero as it gets, so you can have both.

Doug
What's more important? Spoke count or rim profile? (nm)rogue_CT1
Mar 20, 2003 12:35 PM
Hed states that rim profile matters most.
The best aero wheels = 0.4 mph at 25 mphKerry
Mar 19, 2003 5:33 PM
And there aren't many that are that fast. Some that would claim to be aero add half that advantage. Beyond that, some claim wheels like Ksyriums to be aero, and they are not. Many paired spoke wheels are no faster than a conventional wheel (it's the number of spokes and the rim profile, not the spoke pattern). Dropping from 36 spokes to 24 (both wheels) is good for around 0.2 mph. Rim profile of at least 50 mm is needed to get that portion of the performance contribution, and that's where the wheel becomes sensitive to crosswinds. While aero wheels are faster (even though heavier) in most circumstances, for most riders this advantage would add up to just a couple of minutes in a 100 mile ride. Very important in a solo time trial, but meaningless for the rest of us.
how much at 50 mph? nmDougSloan
Mar 19, 2003 8:14 PM
2.7 mph at 50 mph? nmKerry
Mar 20, 2003 4:51 PM
sounds about right nmDougSloan
Mar 21, 2003 7:21 AM