How To Determine the Correct Replacement Trailer Hub Assembly

Updated 03/11/2011 | Published 03/10/2011

Question:

The manufacturer of my boat trailer said my hub bearings have an inner measurement of 1.063 and an outer measurement of 1.375. How do I know what hub replacement kit to buy?

asked by: Charles W

Expert Reply:

The best way to determine which hub assembly you will need is by the bearing numbers. The item you selected, Trailer Hub Assembly, part # 8-258-5UC1, is a replacement hub which uses Inner and Outer Bearing # L44649. The bearing numbers will be stamped or lasered onto the flat back side of the bearings.

The other things you will need to determine are the bolt pattern, the size of your trailer wheel, and the axle capacity. Part # 8-258-5UC, is compatible with a 5 on 4-1/2 bolt pattern. I have linked an FAQ showing how to determine the bolt pattern on your wheel. Then, you can measure the diameter of your wheel or look on the tire, at the third number set on the tire size (see Tire FAQ).

expert reply by: Reno H