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How to Determine Hub and Spindle Size  


Your 1.5 spinle has the 2nd measurement as 1.73, which is wrong. thats the dim for the 1.75 hubs 2nd dim.


Expert Reply:

The spindle dimensions are as follows: A is the mounting dimension, B is the seal dimension, C is the inner bearing surface, D is the outer bearing surface and E is the diameter of the threaded portion of the spindle for spindle nut selection.

Say you need a spindle and hub for a wheel with 5 on 4-1/2 inch bolt pattern and an axle that is 3500 lbs. For a single axle trailer you can use two of either the item # TRU64FR, if your axle is round or item # TRU47FR if your axle is square. Then you need two hubs, part # 84545BX. If you want to use EZ-Lube spindles and hubs you will need to order the round spindles, item # TRU74FR and the EZ-lube hubs item # 84545UC1-EZ hubs.

If you have a spindle you need a hub for let me know the dimensions and I will be glad to recommend the proper parts for your trailer.

expert reply by:
Bob G



Bob G i have a question, i am rehabing an old trailer that has 6 lugs on a 5.5 circle and can not find new hubs anywhere. The outer bearing diameter on the spindle is 1 in and from what i see the inner bearing spindle diameter is 1.5in. If you have any advice i would love the helpThank you

Patrick B.


We have quite a few hubs that cover the 6 on 5-1/2 bolt pattern. What we need to determine still is the spindle that we need to fit to. The easiest way to do that is to look at the bearings and the seal/s and find their part numbers. Once we get that established it will be easy to determine what hubs are available. If the numbers cannot be found on the bearings, then we can measure the spindle, but that needs to be done using a dial or digital caliper to measure 3 decimals or thousandths. Here is a link to all the 6 on 5-1/2 hubs and drums we have.

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