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Determining Type and Weight Capacity of Trailer Leaf Springs


Im getting ready to upgrade my utility trailer. Your axle kit #20440I, bolts, wheels, etc. Im looking at your springs, SP-169275, with a c-to-c of 20 3/8. My trailer has 20 1/2inch between bolts and the rear is a bent section laying on the bolt, not an eye. Will your spring fit or would I need to move the bolt? Does it matter if my spring does not have a rear eye? Thanks!


Helpful Expert Reply:

The two leaf spring types you described are known as double-eye and slipper types, and they are used for different applications. You can refer to the two linked articles on trailer suspensions for lots more info on both types of trailer suspension.

I also linked our main page for trailer leaf springs, both types. Click on your spring type and width at the top of the page to see all products in that category. You want to select springs based on the axle weight rating, which is usually found on the axle itself or on the trailer's main VIN sticker. The axle kit you mentioned, part # 20440I-ST-60, is rated for 2000-lbs.

For instance, the shortest slipper springs we offer are 24-5/8-inches and are for axles rated from 1000-lbs up to 2000-lbs. Part # SP-178275, for example, is this length from the center of the eye to the very end of the leaf.

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