Set of 2 6303ZZ double shielded scooter wheel bearings. Also commonly referred to as 6303Z series.

Shielded (ZZ or Z suffix) scooter bearings of this size are commonly used in wheels, transmissions, gearboxes, and various other GY6/QMB139 engine components.

These single-row, deep groove ball bearings are designated as medium-weight and feature a 17 mm diameter bore hole.

Be sure to check your existing bearings for the series number, which is often etched onto the outside wall of the bearing.

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