How to Measure Trailer Leaf Spring to Find Correct Replacement
Question:
How do I measure the length of utility trailer springs, straight across or along the curve? The ones on there now measure 32 1/2 inch along the curvature from the center of one bolt hole to the center of the other bolt hole.
asked by: Cliff C
Helpful Expert Reply:
To correctly measure a leaf spring, you'll want to jack the trailer up on jack stands so the axle is hanging freely, then measure directly across from the center of one spring eye to the other, as shown in the provided diagram. The height of the spring and the distance from the spring eye to the center of the spring can also be helpful in finding the correct replacement.
To ensure you're getting the correct leaf springs, you'll also need to know the capacity of your axle. If you can find that information on the axle itself, we can make a pretty good guesstimate if you can provide as much as the following information as possible:
Axle diameter (or circumference divided by 3.14)
If the axle is 1 to 1-1/2 inches in diameter, it's likely a 1000 lb axle
2-3/8 in diameter, 3500 lb axle
3 inches in diameter, 6000-7200 lb axle
3-1/2 inches, 8000 lb axle
4 inches, 9000 axle
5 or more, 10000 lb axle
Knowing the wheel bearing reference numbers or the wheel's bolt pattern will also be a good clue to the axle capacity.
Daniel E.
3/30/2025
Hi, I have a 2016 Xpress boat with trailer manufactured by Back Track Trailers. The 4-leaf double eye springs are badly rusted and I don’t know if I can trust the measurements as they are separated between the leaves and look to be “flattened” somewhat. The trailer model number is AWHD 16, and has a 2” square 3500lb single axle. It is sitting at 26” from center eye to center eye on the ground. I don’t have the owner’s or the repair manual for the Back Track trailer. Is there a way to determine which springs I need from this information?
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Tim K.
7/30/2020
I've done measurements. 25 from eye to eye. 1and 3/4. Wide 8 lugs 7 springs. It's a 40fr toy hauler Any suggestions would be greatly appreciated. No one and here has anything like that