Smooth rotation starts with the right bearings. XRAY 950508 flanged ball bearings in 5x8x2.5mm size sit securely and spin freely across many RC parts. The pack includes two bearings so you can cover an axle or swap a worn unit during maintenance.
A flange provides a built in shoulder so the outer race cannot slide axially. That reduces alignment problems and helps keep gears and wheels running true, which matters under competition and heavy use.
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