The Speed 55 DB wheels were designed for extreme racing conditions and aerodynamic performance, featuring high-profile 55 mm carbon rims, ultra-smooth ceramic bearings and disc brake hubs. - 55 mm high-profile carbon fiber rim with undrilled rim bed for added strength and simplified tubeless set ups - 19 mm internal width and 2-Way Fit(TM) technology for larger clincher or tubeless tires - Ceramic ultra-smooth bearings - 2:1 spoke ratio with disc brake hubs