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Wheel bearings are the rolling bearings that let the wheel hub and wheel turn smoothly while carrying the vehicle weight. They sit between the hub and the axle spindle, allowing low-friction rotation under heavy load, braking, and cornering forces. They are safety-critical parts.

A wheel bearing lets the hub rotate freely around the axle with minimal friction, while supporting the vertical load of the vehicle and the side loads of cornering. A seal keeps grease in and water and dirt out. On heavy vehicles the bearings are often a pair of tapered rollers set up with the correct preload so the wheel turns true.

Bearings wear with mileage, and a failed seal lets in water and road salt that mix with the grease into a corrosive paste, accelerating failure. Signs include a humming, grinding, or growling noise that changes with speed or in turns, vibration, wheel play, uneven tire wear, and a hot wheel hub. Because a failing bearing rarely recovers and can lead to wheel separation, it is inspected and replaced promptly, set to the correct preload.

The correct bearing depends on the vehicle model, the axle, and the bearing size and load rating. Confirm the part against the vehicle specification before fitting, and replace seals at the same time.