Determining Correct Bearing Kit for 1-1/16 Inch Trailer Spindle

Question:

whats the difference between a tapered and straight trailer spindle and how do I know which bearings I need? 12inch wheel with a 1-1/16 spindle Thanks

asked by: Adriel

Expert Reply:

A tapered spindle's compatible bearings will have different inner diameters. This is because the bearing seat locations will differ in terms of their diameter as the spindle goes out from the axle. A straight spindle will not have these tapered dimensions and will use bearings with the same inner diameter.

The easiest way to determine which bearings are used on your trailer axle is to take the hub off and check the numbers that should be stamped into the bearings themselves. If you cannot locate the numbers, you can also take a few measurements on the spindle using a digital caliper like # PTW80157. I have included an image that shows where these measurements will be taken.

If you have a straight, 1-1/16 inch spindle, the correct bearing kit may be Bearing Kit # BK1-150. This kit comes with the inner/outer bearings # L44649, which has an inner diameter of 1.063 inches, along with a 1.500 inch inner diameter grease seal and # L44610 inner and outer race.

I do still recommend verifying the existing bearings on your trailer to ensure this kit will work. I have also included a couple articles on trailer bearings and hubs that you might find helpful.