Don't let your wheel bearings steal precious energy away from your athletic efforts. Upgrade them today with a CeramicSpeed Bearing Kit from Zipp. Your Zipp wheels come with the highest grade steel bearing available. But if you're looking for that extra advantage, the Zipp CeramicSpeed Upgrade Bearing Kit is the best way to gain valuable speed and performance. This upgrade bearing kit is specifically made for Zipp wheels by CeramicSpeed, an industry leader in ceramic bearings. Waste not, watt not with the Zipp CeramicSpeed 61903 Upgrade Kit.Bearing Kit 61903:
- One kit required for: Zipp 188v9, 30 and 60 rear hubs
- Lowest resistance hybrid ceramic (ceramic balls and steel cages) available
- Energy savings between 1.5 and 9 watts per bearing set, depending on level and conditions of existing wheel bearings
- Inner Diameter: 17mm
- Outer Diameter: 30mm
- Width: 7mm
88 front and 188v9 rear hubs are on all 2014 and newer Zipp 101, 202, 303, 404, and 808 wheels.Shipping weight: 1.0 lbs.