Zipp part number 11.2018.067.000 includes two 61903 ceramic bearings and is compatible with the following hubs:
- ZR1 road hubs
- ZM2 mountain hubs
- 76/77 front disc hubs
- 176/177 rim brake and disc rear hubs
- Cognition front disc hubs
- Cognition rear hubs (rim and disc brake*)
Zipp part number 11.2018.067.001 includes two 61803 ceramic bearings and is compatible with the following hubs:
- 76/77 front rim brake hubs
- Cognition rim brake front hubs (Generation 2*)
- ZR1 driver bodies
- ZM2 driver bodies
- Cognition driver bodies
*Neither ceramic bearing kit is compatible with first-generation Cognition rim brake hubs. 2nd generation Cognition rim brake rear hubs begin at serial number 21P81803697 (printed on the hub near Zipp logo).