One of the most common things we get asked about SumoSprings is the meaning of the colors and why it makes a difference to the application. We’re here to tell you what it all means.

The SumoSprings airbag alternative isn’t rubber. This suspension solution is made from micro-cellular polyurethane which means it never requires any maintenance. And all our products come with a lifetime warranty. Because SumoSprings aren’t a rubber bump stop replacement, they perform differently.

Instead of a harsh bump stop, these are progressive springs that provide support when you need it but let you enjoy your factory ride quality when you don’t. This is why we use the term density when talking about SumoSprings, instead of durometer, which is more commonly used when talking about rubber.

During the manufacturing process, we carefully trap air pockets in the material to create a progressive nature in the spring. Each color traps a different number of air pockets, and that’s what creates lighter or heavier densities that allows us to add or reduce load capacity.

We manufacture three colors of our SumoSprings; blue, black and yellow. Those colors signify the difference in the density of the spring.

Blue SumoSprings are our lightest density, the black is our medium density, and the yellow is our heaviest density SumoSpring. The part number ending also signifies those densities. Blue SumoSpring part numbers end in -40, the black end in -47, and the yellow end in -54.

Having the right color SumoSpring for your setup is really important. So no, in this case, bigger doesn’t mean better. You could pick a SumoSpring with a higher-density load support but it could really negatively affect your unloaded ride quality. We want to help you pick the right one based on your setup, your vehicle, your lifestyle, the way you intend to use it. You can always contact us if you need a little extra help picking.

You’ve probably seen a lot of our content across the Internet showing our blue SumoSprings, and that’s because it’s the most common density in our applications. That’s because it provides really good support, reduces vibration, and fixes sagging and body roll. Plus, this density doesn’t impact your unloaded ride; that’s really the key here — unloaded versus loaded.

If your vehicle is constantly loaded like a built-out van or a truck with a camper on it full time, then you’re probably going to want to go with a higher density like black or yellow for the additional support as well as the vibration reduction.

On the other hand, if you’re a weekend warrior towing a camping trailer behind a truck, blue is always the way to go because it gives you all the support and control you need, without affecting your factory ride quality on daily driving.

Check out this video where, Adam Weisner our President, shows the differences in the colors.