When it comes to all-around performance among rim brake wheels the HED Jet RC4 Black Clincher Wheelset has no rivals. Starting with a 21mm internal 25mm external rim width HED’s Jet RC Black wheels feature best-in-class performance in both aerodynamics and braking technology. Hours were spent testing and refining a textured braking surface called Turbine Braking Technology. With special machining and anodizing the result is a clean all-black appearance and confidence-inspiring braking performance.