A wheel hub on a tractor trailer is a central component that connects the wheel to the trailer’s axle and enables the wheel’s rotation. The wheel hub supports the trailer’s weight and ensures stability and smooth movement when the trailer is towed by the tractor, even on uneven terrain.

There are generally two types of wheel hubs for tractor trailers: fixed hubs and hubs with integrated wheel bearings. Hubs with wheel bearings reduce friction and allow for smoother movement, which is especially beneficial for trailers carrying heavy loads or operating on varied terrain.

Signs that a wheel hub may need to be replaced include unusual noises such as grinding or humming and a loose or wobbly wheel. A damaged wheel hub or bearing can also affect the trailer’s stability, especially when carrying heavy loads.