Can I Replace the Leaf Spring on My Boat Trailer with a Flat End Leaf Spring?

Updated 09/26/2025 | Published 05/02/2025

Question:

I have a single axle boat trailer with broken springs. Can I replace 1 3/4 x 30 radius end springs with flat end springs?

asked by: John C

Expert Reply:

Hello John,

Great question. If you have a double eye leaf spring on the trailer, then you will not be able to replace it with the 3-Leaf Slipper Spring w/ Flat End for 2,900-lb Trailer Axles - 30" Long # e49SR.

What kind of leaf spring do you have on your set-up? What is the axle capacity? What is the measurement from eye to eye with the weight off the spring? It is normal to have a measurement that is longer than what you need as they do stretch over time. I attached some images to show where to measure the leaf spring. Please reply with those answers so I can get you the right leaf spring.

expert reply by: Kate F

How to Measure Flat Leaf Spring
(click to enlarge)

How to Measure Double Eye Leaf Spring
(click to enlarge)

Kate F.

9/26/2025

Hey John, did you have a chance to check the type of leaf spring and the axle capacity on your trailer? I'm asking because I want to make sure you get the right replacement and help others in a similar situation.