BEST FOR: World Cup racers and wannabes.
THE TEST: Open is a startup from Gerard Vroomen, cofounder of Cervélo, and there are plenty of nods to his past, including surgically sculpted carbon wire-thin seatstays and full internal cable routing. But the only detail that matters is how fast this thing goes. “Twitch your right toe and you shoot forward,” remarked one tester. Credit, in part, the Enve wheels, which are some of the lightest we’ve ever ridden, though the Schwalbe tubular tires (yes, on a mountain bike) are practical only for racing.
THE VERDICT: It’s no soft ride, but that’s not the point here—winning is. 18.2 lbs.