Hanger Spacing for Tandem Axle Trailer Using 25-1/4-Inch Leaf Springs

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Question:

I have 25 1/4 inch springs with treq310 equalizer what is my hanger spacing

asked by: Kelley

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Expert Reply:

The distance on center between the spring hanger bolt holes for dual axle setups, with the # APT9 Tandem-Axle Trailer Hanger Kit, should be 29-1/2 inches for double eye springs that measure 25-1/4 inches on center between the spring eyes and for axles that are 3 inches in diameter. This will put your axle spacing somewhere between 33-1/2 and 34 inches.

You will also need to determine the position of the axles before welding the spring hangers into place. The general rule of thumb for double axle trailers is that 60 percent of the trailer weight should be forward of the center between the two axles.

There is a formula that can be used to tell you how far to move the spring hangers when mocking up the trailer.

Once you have all of the parts you will need to determine the correct position for the two axles. This is done by weighing the trailer weight under the wheels and then weighing the tongue weight. Once these weights are determined, you will need to add the two numbers together to get the total weight.

Once the total weight is determined, you need to measure the distance to the center point between the two axles. Now figure the percentage of tongue weight. If it is more than 10 percent, you will need to subtract 10 percent of the total weight of the trailer from the tongue weight. Then, divide that number by the total weight of the trailer. Next, multiply the answer by the on center distance between axle center and center of the coupler. The result will give you the distance that the center line of the axles should be moved forward.

If you have less than 10 percent tongue weight, you will need to move the axles rearward using the following equation. Take 10 percent of total trailer weight and subtract the tongue weight. Then, divide by the total weight. Multiply that by the center line distance between axle center and center of the coupler. The result will be the distance that the center line of the axles should be moved rearward.

The linked article on trailer suspensions will give you additional information.

expert reply by: Adam R

0

Answer 1

The leaf springs part #e77SR are actually exactly what you need. Over time old springs will stretch slightly which is why your older springs are 5/16 inches longer that these. Aside from that these match perfectly, 2k capacity and 1-3/4 inches wide.

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Answer 2

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 3

Based on the measurements you have given, the correct kit would be the #K71-657-00 Dexter E-Z Flex Suspension Kit - Double-Eye Springs - Triple Axle - 8,000 lbs. You want to use the short equalizers. The hangers you have are designed for the…

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Answer 4

If you have 6000 pound axles then the Double-Eye Spring, #e27SR will not be heavy enough for your trailer. It is only rated for a 4,500 lbs axle. When replacing springs on an axle you divide the axle carrying capacity in half to get the spring…

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Answer 5

The differences are the dimensions of the hangers and equalizers of the three kits. The #APTT1 uses totally straight equalizers and taller center hangers. The #APTT3 uses more traditional sized equalizers and center and outside hangers that differ in…

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Answer 6

For your double eye springs that are 25-1/2 inches, it is likely your hangers are 29-1/2 inches apart on center and your springs most likely were originally 25-1/4 inches as they will stretch slightly over time. For instance if you were to use 25-1/4…

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Answer 7

I would need to know the axle capacities to be sure but I can venture an educated guess. The only tandem axle double-eye leaf spring hanger kit we have that includes 8 inch equalizers is #APT1. With this kit, the center of the forward hanger to the…

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Answer 8

I attached a picture that shows the proper position of shackles and equalizers on trailer suspension. Sometimes the shackle will flip up but if you jack up the trailer by the axle that's got the shackle flipped you can usually get it to flip back…

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Answer 9

Thank you for purchasing from etrailer! You did a great job selecting compatible parts. When using Leaf Springs #e64SR with the #AP233 Equalizer Kit and the #H248 Hanger Kit, there should be 29-1/2" between the front and center hangers and…

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Answer 10

I did some research and it looks like your Bigtex 16 long tandem axle landscape trailer has 9" x 72" fenders. I recommend the Tandem Axle Teardrop Trailer Fenders for Enclosed Trailers - 15" to 16" Wheels item #HP74VR.

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Answer 11

The position of the axle should dictate the position of the springs and hangers not the other way around. With that being said, in order to determine proper placement of the hangers you will want to take the the distance between the two eye holes on…

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Answer 12

In the attached diagram the A measurement is actually the distance from the center of the spring hangers for a single axle trailer. The spring eye to spring eye measurement for your leaf springs will be slightly different. The B measurement that you…

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Hanger Spacing for Tandem Axle Trailer Using 25-1/4-Inch Leaf Springs

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