How to Determine Trailer Axle Hub Face to Hub Face Dimension

Question

Question:

New utility trailer, want single 3500lb 4” axle, need 71” spring eye centers. Will be running 225/75/15 tires. I don’t have a hub face measurement how do I figure it out? Thanks

asked by: Bill

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Expert Reply:

To determine hub face to hub face dimensions on your trailer axle you'll want to put the trailer on jack stands so that you can take the wheels off and then measure from one hub face to the other hub face.

expert reply by: Jameson C

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Answer 1

Our strongest regular spindle is the #42 Spindle, #TRU57FR. This spindle is for a 7000 lb axle and the idler hub assembly is #AKIHUB-865-7-1-K. If you wanted a drum assembly with brakes, you would want the #AKHD-865-7-2-K hub and drum assembly with…

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Answer 2

When you replace the axles on a trailer you will look at the (A) hub-face-to-hub-face and the (B) spring-center-to-spring-center measurements and choose an axle that has the same measurements that your current axle does. Since you are wanting to add…

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Answer 3

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 4

Even though I cannot comment specifically on the grease you used because I am not familiar with it, I can tell you the best grease for trailer bearings is a a grease with a rating of GC-LB, which just means it is made to withstand very high…

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Answer 5

Thank you for providing the specs for the suspension components that you already have. Correct hanger spacing really depends on the components being used such as springs, hangers and equalizers. Most of the hanger spacing dimensions that we have are…

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Answer 6

You can use leaf springs that are rated higher than the axle without any issues as long as they measure the correct measurement for your trailer. For example the 6-leaf double eye spring for 7,000 lb axles part #e64SR measures 24-7/8" eye to…

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Answer 7

The determine the correct replacement leaf spring on your 2021 Coachmen 259FKDS you'll need to lift your trailer frame so the spring is hanging freely and then measure from center-eye to center-eye, then for the equalizer you need to measure…

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Answer 8

There is no exact way to determine the leaf spring length. The best way to determine the length for a replacement is by measuring the existing leaf springs. The hanger distance and shackle length can help you get a good idea, but you're looking…

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Answer 9

Trailer wheel bearings are specific to the spindle that is installed on the axle that is on your trailer. You will need to safely support the trailer, remove the wheel and tire, remove the grease cap, remove the cotter pin and washer that secures the…

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Answer 10

It sounds like you are speaking of the wires for the brake magnets. If this is correct, you will need to connect one of the wires to the brake controller output wire on your trailer connector and the other wire will need to be grounded to a clean…

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Answer 11

Hey Darrel, we actually have exactly what you are looking for with the part #TRU52FR which is for a 7k axle and is 25-1/4 inch from eye to eye. This is also a 6 leaf spring as well. The spring you referenced would be too short.

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Answer 12

The difference between an load range C and load range D tire in the same size is the capacity and psi rating. The two tires will still have the same dimensions and fit on the same wheel. The D rated tire has a higher capacity. For a ST175/80D13 like…

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How to Determine Trailer Axle Hub Face to Hub Face Dimension

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