Best for Long Hauls: Giant Defy Advanced 0

Though it technically falls into the comfort category, the Advanced 0 is made to move. Not that you'll notice: Thanks to bolstered stress points (oversize bottom bracket, tapered steerer tube) and a streamlined design (aerodynamic seat post, thinner composite construction), the bike feels as stable over dirt as it does down paved descents. And it's tech-heavy, too, with a chainstay-integrated cadence sensor and an electronic Di2 drivetrain. [$4,800;]