"S Stands for Speed & Carbon Spoke."

Tubeless-Ready Hook Rimset 24mm Internal Width
UCI Approved
Disc Brake & Center Lock
Farsports In House Light Weight Rachet System Hubset
FARSPORTS 5.0mm Bladed T-head Carbon Spokes Technology
Incredible Stiffness
Optimized for Max Power Transfer
Lightweight 
Proven Aerodynamic Performance
Robust Hub Weather Sealing Design