Zipp Bearing Kit

This kit is specifically engineered for the Zipp ZM1 rear hub. It is not compatible with other Zipp hub models, so please verify your hub model before purchasing.

Yes, this kit includes the essential cartridge bearings—specifically one 6903/61903 bearing and one 63803D28 bearing—required to service your ZM1 rear hub.

These replacement bearings are crafted from durable steel. They are designed to meet Zipp's factory standards for longevity and consistent performance on both road and trail.

Yes, installing cartridge bearings requires a bearing press and specific drifts to ensure they are seated correctly without damaging the hub shell or the bearings themselves. If you do not have experience with hub maintenance, we recommend having a professional mechanic perform the installation.

You should consider replacing your bearings if you notice grinding, clicking, or a gritty feeling when spinning the wheel by hand. Additionally, if you detect any side-to-side play in the wheel while it is mounted in the frame, it is a strong indicator that the bearings are worn and need attention.