Replacement bearings for the ZM900 hubs are listed below.
11.2028.062.000 BEARING KIT ZM900 FRONT HUB (INCLUDING 2 O-RINGS)
11.2028.062.001 BEARING KIT ZM900 REAR HUB (INCLUDING 2 O-RINGS)
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.