Hey there Cat...
My partner TT bikes have been a Giant, an EMC2 and his latest is a Cervelo.
He would recommend the Cervelo if he was answering this question.
The other name I know in your list is Kuota, and i would like one of those please.
Weight is not such a consideration in a TT bike unless the TTs you do are over hilly courses.
Also, with a TT bike you might be able to get smaller frame than your ride bike, simply because of the different position you ride in.
The biggest difference on a bike will be the aeros and bullhorns, which not only help you get more aero yourself, but also present less resistance to the wind.
An aero front wheel gives you more time than a disc on the back.
We have just got our digital camera fixed, so will take some pix of our TT bikes this weekend and explain them for you and that may be of use.
Cheers, Raven



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