Lowest resistance hybrid ceramic (ceramic balls and steel cages) available;Measurable wattage savings between 1.5 and 9 W per bearing set, depending on the level and condition of your existing bearings;Available in convenient two-packs for Zipp front hubs, rear hubs and free hub driver bodies

• ZIPP Bearing Kit Front ZIPP 77/177D 61803 - Pack of 2
• Black

ZIPP Bearing Kit Front ZIPP 77/177D 61803 - Pack of 2Zipp