[green iguana]

I never race on solid rear disks on hilly courses.

Why not?

[ironman]

"I never race on solid rear disks on hilly courses."

Weight. My rear Zipp 404 is lighter. I am very small for an elite level triathlete so I am very attentive to the weight of my equipment. I simply can't put out the watts of the bigger athletes. I ride an Trek OCLV 5500 w/ mostly dura ace with a few special components like Thompson seatpost and Brew ti brakes. Under 16 lbs, 5 year old setup. In my size frame if I went with current state of the art I could get it under 15 lbs but it'd cost me more than $5K to do it.