Zipp CeramicSpeed Bearing Kit: Modified For 77 Front Hub and 177 Rear Free Hub

- Includes 61803 bearings and one grease syringe
- Measurable wattage savings between 1.5 and 9 watts per bearing set, depending on the level and condition of your existing bearings
- These 61803 bearings are not interchangable with the 88/188 hub 61803 bearings