pan y agua
Join Date: Aug 2005
Bikes: Wilier Zero 7; Merlin Extralight; Co-Motion Robusta; Schwinn Paramount; Motobecane Phantom Cross; Cervelo P2; Motebecane Ti Fly 29er; Calfee Dragonfly Tandem
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I have a HED disc, which I got for $599. It seems reasonably well made. It's heavier than a Zipp, but that's not a big concern for flat TT's or Tri's. It is a lenticular disc, which is supposedly more aero, and limited by patent rights to HEd and Zipp. Of course you don't get the little golf ball dimples.
I got the HED instead of the Renn because 1) I put a little more faith in the HED name, given their history with aero products, 2) buying into the lenticular marketing (probably a fair amount of BS), and 3) not being familiar with Renn. Admittedly none of these are overwhelming arguments, but the HED has worked out ok for me. (And when I get the HED tri spoke for the front, my logos will match)