Help w/ 650c wheels

[Seajay]

Here's what I got from Zipp this AM.
I can tell you that we are recommending to our pro teams as well as pro-triathletes to run 21mm tires with both 808's and 404's, and NOT to run 18 or 19mm tires. We have seen no repeatable aero advantage in using 19 or even 18mm tires with these new rim shapes (though with the new 404, there was a slight tendency for increased drag with the 19mm tire, and feel that the increased ride harshness, reduced contact patch, increased rolling resistance and so on associated with narrower tires just can't really be justified on either of these rims.

Now, if you are running an H3, old Zipp 440, Campy Bora or Reynolds wheel, then we have definitely seen advantages in the wind tunnel to running 18 or 19mm tires over 21 or 22mm tires, and I would strongly recommend them for those applications from a pure speed perspective, but with the newer Zipp rim profiles, I can honestly say use a 21mm at a slightly lower pressure, and save yourself the added harshness of the high tire pressure as well as gaining back some improved handling and still maximizing aero benefits. These latest generation wheels have been fully designed around 21-22mm tires, so you can be confident that you are not sacrificing any performance with them.

There is some additional info but it reads better in the tire pressure discussion elsewhere on this forum. I'll post it there.

[mixie]

Vitorria Corso Evo CX 320 tpi!!!

Awesome tires. I bought a set of used 404s for my 650c bike and they came with these tires. They rock. I also run the clinchers version on my training wheels.

http://www.discounttrisupply.com/mm5...ry_Code=TIRETR

[KimmyC]

Here is another option that I have. What about a 2011 Hed 4 in the front and Hed 6 in the back? I think this combo is similar to a zipp 303/404 combination, which I prefer I would prefer more than just a set of 404. I think I will have a more difficult time using the 404 wheelset in crosswinds.

Also, with the 2011 zipp 404 650c, I feel like it's older technology and yet I'm paying the same price as with the newest Zipp Firecrest, carbon clinchers. The 2011 404 650c doesn't even have the dimple technology! As for HED, I will be getting the same newest technology/innovations a 700c buyer would get.

Am I right in assuming these things? Or should I just get the zipp and be happy because it's a zipp? Please let me know what you think. Thanks!

[Seajay]

"I feel like it's older technology and yet I'm paying the same price as with the newest Zipp Firecrest, carbon clinchers."
2011 Firecrest $2600
650 404s $1840

?

[KimmyC]

the msrp difference is $400. the difference is minute compared to the advancements between the two wheels. Even so, I've decided to buy the Zipp and I cannot wait to put it onto my Diva and just ride. Warmer weather cannot come soon enough!