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
It's not rocket surgery. You want the cables to be as short as possible, with only smooth bends, no kinking, but long enough that they don't restrict the movement of the handlebars.
Google some images of Kestrel Talon's and you'll get a visual to go by
The second approach, going under the bars is likely less aero, but might shift better.
You could fall off a cliff and die.
You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.