NEW Zipp CeramicSpeed Bearing Kit – 61803 Modified, For Zipp 77 Front Hub Shell and 177 Rear Free Hub Body, Pair

Zipp Cartridge BearingsMeasurable wattage savings between 1.5 and 9 watts per bearing set, depending on the level and condition of your existing bearingsIncludes bearings and one grease syringeThese 61803 bearings are not interchangable with the 88/188 hub