When every second counts, the 2015 Jamis Xenith T2 wind tunnel R and D proves invaluable. The resulting aerodynamic advances, such as wind-cheating aero carbon tubing, hidden brakes, internally-routed cables, and an integrated aero seatpost, shave off minutes. To make it more invisible to the air, this carbon missile boasts horizontal rear dropouts that let you place the rear wheel directly behind the seat-tube cutout for streamlined efficiency.