ZIPP Ceramic Bearing Upgrade Kit 61903 For ZR1 / ZM2 / Cognition Disc Hubs

This upgrade kit for Zipp wheel hubs includes two type 61903 ceramic bearings, which are compatible with ZR1, Cognition Disc and also with older hubs. Ceramic balls made of silicon nitride, bearing races made of chrome-molybdenum-nickel steel, polyamide cages as well as non-contact seals ensure improved function, longer durability and lower friction.
Specifications:Dimensions (Inner x Outer x Width):17 mm x 30 mm x 7 mmDesignation:61903 (6903)Technical Information:Design:deep groove ball bearingsRecommended Use:hubsInner Race Material:stainless steel (chrome-molybdenum-nickel)Outer Race Material:stainless steel (chrome-molybdenum-nickel)Ball Material:Ceramic (Si3N4)Compatibility:ZR1 front and rear hubsZR1 Disc front and rear hubsZM2 front and rear hubsCognition V1 Gen 2 rear hubsCognition Disc V1 front and rear hubsCognition Disc V2 front and rear hubs76 Disc front hubs176 rear hub176 Disc rear hubs77 Disc front hubs177 rear hub177 Disc rear hubsFeatures:ideal upgrade for Zipp wheels or hubs, reduces friction and breakaway torquesilicon nitride ceramic ball bearings for higher durabilitycorrosion-resistant bearing races made of a hardened stainless steel super-alloy on a chrome-molybdenum-nickel basispolyamide ball bearing cages for vibration damping and insulation, improved function and durabilitycontact-free seals possible thanks to high strengthmanufactured in Germany by a medical device specialistNote from the manufacturer:To upgrade a whole wheelset you need three kits (six bearings): two kits (4 pieces) with 61903 bearings for the front and rear hub shells and one kit (two bearings) with 61803 bearings for freehub bodies. Alternatively, you can fit two sets of bearings 61903 in the hub bodies to get the most benefits.
Manufacturer Number:11.2018.067.000
Contents:Zipp Upgrade Kit, consisting of:
2 x 61903 ceramic bearings (17 mm x 30 mm x 7 mm)