Replacement bearings for the 176/76 & 177/77 Rim Brake and Disc Brake hubs are part number 11.2018.061.003 (WHEEL BEARING KIT FRONT/REAR 76/77 176/177 DISC, REAR 176/177 RIM, ZR1 61903 QTY 2).
ZIPP service kits and spare parts are best obtained through your local shop or dealer. See our dealer locator, below, to find a dealer near you. If no one is currently listed near you, then please search for local shops via your preferred web browser.
https://www.sram.com/en/dealer-locator
Manuals and additional information about ZIPP and SRAM components can be found at our service site, linked below.
https://www.sram.com/en/service
Further questions?
Reach out to Rider Support by Asking A Question at the link below.