Replacement ball bearing set for Zipp wheels with Zipp ZR1 front hubs for rim brakes and disc brakes, Zipp wheels with Cognition V2 rear hubs and various other Zipp hubs. The set consists of two 61903 stainless steel ball bearings.

Specifications
Material: stainless steel
Compatibility front wheel hubs: Zipp ZR1 rim/disc brake | 76/77 disc brake
Compatibility rear wheel hubs: Zipp ZR1 rim/disc brake | Cognition V2 Rim Brake | 176/177 rim/disc brake
Bearing type: 2x deep groove ball bearings
Dimensions (inner x outer x height): 17x30x7 mm
Seal: seal on both sides

Mfr Claimed Weight
30.3g