How to Determine the Correct Replacement Bearings for 40" x 48" Ultra-Tow Trailer

Updated 03/03/2022 | Published 03/02/2022

Question:

Ultra-tow 40X48” trailer bearing replacement. How can I determine the correct bearing replacement? Thank you.

asked by: John M

Helpful Expert Reply:

In order to find the correct replacement bearings for your Ultra-Tow trailer you are going to need to pull off the hubs and take a look at the bearings. Part numbers are typically stamped in the side of the bearing which can be used for identification.

If you can't find a part number, or it has worn off, you will need to take some measurements. I recommend using a digital caliper like the #PTW2993. You will be measuring the inner diameter of the bearings or the spindle where the bearings ride. Once you have this measurement you can find the correct replacement bearings.

I have attached some helpful articles on wheel bearings, along with a diagram showing where to measure and find part numbers for your reference.

expert reply by: Robin H