Mercury Wheels S1 Road Wheelset. Perfection is hard to beat, but that doesn't stop Mercury Wheels from improving on tried and true performance. The Mercury Wheels S1 alloy road wheelset is new for 2016, featuring overhauled hubs inside and out. The flanges have moved outwards, the axles have been optimized for strength, while they still feature 6 sealed cartridge bearings to keep things rolling super smooth. The S1 aluminum rims are a solid 24mm 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. What does this all mean Expect one of the smoothest and durable set of wheels you will ever ride no matter if it's for road, cyclocross, or gravel riding endeavors.