Mercury Wheels S3C Carbon Road Wheelset. Short and wide are not exactly the most flattering attributes, unless you're a lightweight rim. The Mercury Wheels S3C Carbon Road Wheelset features carbon fiber rims with a 30mm depth to provide stability in any crosswind condition, but also to provide a laterally stiff wheel due to the rim profile and spoke lacing pattern. The lacing pattern radial in front, 2x in rear allows Mercury Wheels to build these wheels using a slightly lower spoke tension without sacrificing a gram of performance. Mercury Wheels designed the S3C rim with a wider rim profile with ample internal rim width to create a sense of traction like a Formula 1 car hugging the corners at 150mph. The S3C'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.