Mercury Wheels S5C Carbon Road Wheelset. Looking for a do everything, high performance, lightweight, and aerodynamic set of wheels Look no further than the Mercury S5C Carbon Road Wheelset. By far Mercury Wheels' most versatile wheel, the 55mm depth of the carbon fiber rims adds a ton of aerodynamic firepower without adding too much weight. You can finally take advantage of the aerodynamics on rides that usually have one too many hills for wheels at this depth. Don't just wait for race day, though, as they're durable enough for everyday use and will be right at home at your local Wednesday Night Worlds or a fast club ride. Additionally, the S5C's rims are a solid 23.5mm wide, which means you can run lower PSI for a more comfortable ride that corners with unparalleled confidence. Wider rims also have some counter intuitive effects when compared to those standard 19mm rims: they actually decrease rolling resistance and increase aerodynamics.