Zipp CeramicSpeed Bearing Kit - 61803 x1, 61903 x1, For Sub-9/Super-9 Hub Shell

Zipp Cartridge Bearings Measurable wattage savings between 1.5 and 9 watts per bearing set, depending on the level and condition of your existing bearings One kit required for: Zipp Super-9, 900 tubular and Sub-9 disc rear hubs Includes bearings and one g