Michigan Truck Spring is an accredited business with the BBB.
Measuring Trailer Leaf Springs
Measuring Trailer Leaf Springs
Measuring Trailer Leaf Springs

Steps to identify and Measure a leaf spring

1) Determine the type of trailer spring. What do the ends of your trailer spring look like? Below are images of the most common types of utility trailer springs.   Determine if you have a double eye spring or a slipper spring with a flat, radius, open eye, or hook end.


2)  Measure the width of the spring. The majority of trailer springs for boat, motorcycle, horse, camping, flatbed, and utility trailers are 1-3/4 inches wide.  To determine the width, simply measure along the center of the top leaf.

3) Measure the length of the spring. If you are replacing a spring, getting the same length is important. To measure the free length, refer to letter ā€œCā€ above. It is important that your trailer is unloaded when measuring the length. When determining length (C), measure from the center of one spring eye to the center of the other spring eye for double eye springs. Measurements will vary depending on the age and fatigue of your spring. We offer a large selection of trailer springs. Determining the length first will narrow your selection down considerably and make finding the correct spring quicker.

4) Capacity and how many leafs. Determine what type of capacity you require and how many steel leaves your existing springs have. If you are replacing all of your springs, the number of leafs will not be as important.  You can switch from a 4 leaf to a 3 leaf with thicker steel if you prefer. The capacity ratings are per spring. Determine the rating of your trailer axle and then select the capacity of your springs. If you have a 6000 lb. rated trailer axle with two springs, use two 3000 lb. rated or higher trailer springs.  

5) Measure the free open (H) and the arc (A) and (B) of the trailer spring. These measurements are more for reference and will change with the age and fatigue of your spring. These measurements can show you the importance of replacing all of your springs rather than one at a time. If you have an older spring that has lost its arc over time and you add one new spring with a taller arc to the other side of your trailer, your trailer will lean to one side causing for an uneven load and unsafe conditions.  

Leaf Spring Bushings

The majority of springs are shipped with 9/16" trailer spring bushings. Please place a comment on your order during checkout if you would like 1/2" bushings. Not all springs can use 1/2 inch bushings, it they cannot and you request them, we will let you know before shipping.

Trailer Spring Capacity

The capacity rating is per spring. If you have a 6000 lb. rated trailer axle with two springs, use two 3000 lb. rated springs.

Change Springs in Pairs

All springs are sold individually, but it is highly recommended to change them in pairs. Changing only one spring may cause your trailer to lean to one side due to the spring fatigue of the unchanged spring(s).

Welcome to Michigan Truck Spring & TruckSpring.com

Since 1926, Michigan Truck Spring has been installing and using the same high quality truck parts that you'll find on our website. In fact, we install everything we sell, and have been selling online as TruckSpring.com since 2001.

Whether you're looking to overhaul your truck suspension, or make a minor repair, our mission is simple - to make sure you have the quality parts you need, and to become your trusted source for truck parts.

Located in the heart of the Midwest, Michigan Truck Spring employees are trained technicians in truck parts and repair. We're here to help, whether it's selecting the right product for your vehicle, an installation question, or a maintenance question, we'll help you through your project. We work hard to make sure you get the right parts for the job. You won't find a company more passionate about truck parts than Michigan Truck Spring.