Designed for year-round training or road racing30mm deep, 24.5mm wide torodial profile is the most aerodynamic alloy rim Zipp"s ever produced188 hubs allow bearing preload to be adjusted while clamped in the dropoutUpdated 188 hubs feature canted flanges to decrease stress on spokes and a wider bearing stance for increased stiffness and durability188 hubs feature a stiff, 17mm alloy axle and an aerodynamic axle nutHubs feature the same 17mm alloy axle, aerodynamic axle end-caps, and bearing preload adjustment as the 2009-11 genteration hubsWheels are built by hand in Indianapolis, IndianaIncludes black aero stainless skewers24.5mm wide toroidal profile is the most aerodynamic alloy rim Zipp"s ever producedItem SpecificationsColorBlackWeight843gHub Drilling20spokesRear Axle Type10x1Cassette Body TypeShimano 9/10/SRAMHub/Brake CompatibilityRim BrakeRim Depth30mmValvePrestaISO Diameter622/road/29"Valve LengthMed 41-55mmWheel Size700cTire TypeClincherRear Wheel TypeRoadRear Hub Spacing130mmSpoke InfoSapim CX RayRimZipp 111Skewer IncludedYesRim MaterialAlloyInternal Rim Width16mm