Fulcrum Racing Zero Clincher Road Wheelset The mega-drive hub flange improves the stiffness of the wheel & therefore better power transfer. They have also had a great new graphics makeover. Racing Zero is the top wheel of the Fulcrum aluminium range. Its extraordinary performance features & high impact aesthetics make it stand out from the crowd. Differentiated rim heights &8211; 25mm at front for optimal maneuverability; 30mm at rear for optimal power transfer. Triple milling of the rim saves weight but also creates an aerodynamic profile. Fulcrum Dynamic Balance keeps the Racing 0 wheels perfectly stable but is achieved in the rim milling process rather than spokes in the Racing 5. Fulcrum 2:1 spoke ratio on rear wheel, double the number of spokes on the drive side for greater wheel stability & enhanced power transfer in the rear wheel. 16 radial aero spokes on front wheel, 21 on rear. The Racing 0 wheels feature Fulcrums USB (Universal Serial Bus) ceramic bearings which are 30% lighter,