The Schwalbe Pro One Aero Evolution Tire comes as two distinct tires rather than one symmetrical design, developed with Scott, Syncros, and the Swiss engineering firm Radiate specifically to give the front and rear wheels their own optimized shape. That approach paid off in the wind tunnel: the front tire alone cuts roughly 20 percent of the aerodynamic drag Schwalbe's previous benchmark tire produced at 45 kilometers per hour, and it does that at 28mm wide, a width that actually beats the old 25mm tire it replaced. The rear tire trades some of that aero focus for a thicker tread and added puncture protection, since it carries more of the rider's weight and takes more of the road's abuse. What Our Gearhead(R) Experts Are Saying:"I felt the front spin up noticeably quicker out of every corner, while the rear stayed composed under hard braking into the same corners. Running them as the matched pair Schwalbe designed is what actually delivers that split personality."