The aerodynamic benefits of the Reynolds 72 Aero Carbon Wheelset are obvious, just by looking at it. When you consider that it was also designed by none other than Paul Lew, Mr. Aero himself, then you also start to make assumptions about the benefits derived from what you're not able to see, the subtle tweaks that Reynolds applies to ye olde aerodynamic theory to make what it calls the fastest wheels on the planet. The key to achieving this distinction is what the Utah based manufacturer calls Dispersive Effect Termination DET. DET Begins at the rim bed with a maximum width of 26. 2mm, which brings the rim up to the tire's width and creates a generous cradle to glue it to. There are myriad benefits to this design, included reduced turbulence, which causes drag, and increased lateral rigidity and comfort. The rim's deep dish is shaped in a NACA profiled, tapered V shape that ends with a sharp trailing edge. The Aero's shape smooths airflow over the wheel, and when that air passes the spoke face, it's easily reattached at the rear of the rim to reduce stall. DET also means that this stall free sweet spot extends to 20 degrees of yaw a full 7. 5 degrees more than the competition. It's rare to have a real world circumstance of a straight on head wind. In reality, you spend 95% of your riding time between 0 and 20 degrees of yaw with a wind angle anywhere from 0 to 100 degrees in relation to the bearing. A lot of deep rims in this situation act as sails, pulling the bike sideways during sudden changes of direction in windy conditions an effect that's far more noticeable when the rims get over 50 millimeters deep. You're choosing a deep rim because you want the aerodynamic benefits, but poor handling can make any speed gain come to nothing if you're thrown off the road or into another cyclist by sudden gusts. While it's impossible to completely cure this ailment, Reynolds' rim shaping DET distributes side forces read: cross wind so that the center of pressur...