In a perfect vacuum, creating the most efficient aerodynamic bicycle would be an easy job. Just make it light and stiff. But since we don't live and ride in a vacuum, questions of aerodynamics must be addressed, and the Ridley Dean RS 10 Complete Road Bike does so in ways that aren't always intuitive but do produce wind tunnel proven results. By now, you're no doubt aware of the benefits and properties of high modulus carbon fiber, so it should come as no surprise that a manufacturer of Ridley's standing strategically arranges a blend of 40, 30, and 20 ton uni directional carbon fiber moduli throughout the Dean RS in order to maximize comfort without sacrificing efficiency or weight. This is a fairly common practice, but what really sets the Dean RS apart from its competitors is Ridley's FAST Concept design ethos. FAST concept is a bike wide application, extending to the Dean RS F Splitfork, the aerodynamic teardrop tubes, and even the paint used on the frame. The F Splitfork is one of the Dean RS's head scratchers. It actually creates more drag in the wind tunnel, but only while the wheels are standing still. When the wheels are rotating, the F Splitfork nets a claimed 7. 44% less drag than competing fork designs. It achieves this reduction in drag by redirecting the air resistance that spokes encounter at the top of the rotation, when they're moving forward into the wind. Think of the split in the fork as a kind of emergency release valve for the extra wind resistance that a wheel's rotation can create. The aerodynamics of the Dean RS also owe a great debt to the teardrop shaped tubes. Like the varied moduli of carbon in the frame's layup, teardrop tubes are now a standard feature on aerodynamically minded frames, so Ridley ups the aerodynamic ante with paint. Yep, that's not a typo and you did read right: paint. According to Ridley, the F Surface paint addresses the tendency of airflow to release prematurely from certain areas of the frame, which in turn cr...