By now you've likely read a thing or three about wide rims on the road. They round out the tire, they make the ride smoother, they're more aero. HED pioneered that in the modern age, realizing that if it could smooth the transition between tire and rim, the air would in turn flow more smoothly. The Jet 5 Express Clinchers follow this paradigm, with a 23mm external rim width. Additionally, at 54mm deep, and making use of a blunt ish profile, they're aerodynamically powerful but not at the expense of handling. In short, the Jet 5s will give you the speed gains typical of a 60mm deep wheel with the handling capabilities of something more in the 30mm range.