In trailer parts, bearings are used between your brake drum, disc or hub as two parts – the cup and the cone – which are pressed into the hub together to allow a smooth, rolling rotation for the wheels during your tow.

In each hub, there are two pairs of bearings – one for the outer and one for the inner – which each have one cup and one cone. The outer bearings pair (closest to the curb) are the smallest and the inner bearing pair (closest to the trailer) are the larger bearings. The inner bearings are matched with an oil/grease seal to perfectly fit and prevent lubricants from escaping the bearings. To read more about greasing bearings, click here.

In each hub, there are two pairs of bearings, one for the outer and one for the inner, which each have one cup and one cone.

When building or repairing a trailer, bearings can be a complex part to break down. Using the table below, we’ve provided a chart to help you find out valuable information including bearing numbers, the OD (outer diameter) and ID (inner diameter) as well as the width, making finding your trailer parts as simple and as easy as possible.    

Here at Sunrise, our all too willing hands-on team can provide professional expert help and advice on bearings, whether it is determining which bearings you have, or selecting the appropriate grease.