The different SumoSprings’ colors identify their density. SumoSprings come in three different densities: blue SumoSprings are -40, black SumoSprings are -47, and yellow SumoSprings are -54.

Blue -40 density captures more air in the millions of micro-cellular bubbles, creating an air spring suitable for light and medium duty applications.

Black -47 density balances the amount of urethane and air bubbles to create an air spring suitable for light, medium, and heavy duty applications.

Yellow -54 density traps a smaller amount of air in the air spaces creating a more dense air spring suitable for medium and heavy duty applications.

For Class A motorhomes built on the Ford F-53 chassis, our engineers have made the selection process simple. For the front, the most beneficial SumoSprings kit, and sole option, is the -40 (Blue). For the rear, you will see either the -40 or the -54 (Yellow). The density for rear kits primarily depends on the coach’s GVWR. The -40 is listed for 16k-18k coaches, while the -54 is listed for 20k-26k coaches.

For all other applications, whether commercial or recreational, the options can broaden, making the decision just a bit more tricky. Something to keep in mind, is the fact that not every density is available for every application. On the other hand, some applications list all three densities as a viable option. So, in the case where you have multiple densities to select from, which density is right for you?

The main question to ask yourself is, “What are you trying to accomplish by enhancing your factory suspension?” Say the main goal is comfort and ride quality. You may not be towing or hauling additional weight with your Toyota Tacoma, but a smoother ride over potholes, speed bumps, dips, driveways, etc., on your way to the grocery store would make for a much more enjoyable driving experience. This is an example of a light duty application; -40 is the recommended density. The -40 captures the most air of the three densities, creating a soft cushion effect.

Okay, let’s step it up now. You’re still after the comfort, and ride quality, except now you own a boat you would like to tow to the lake once a month. Towing something relatively small may not seem like an issue for your vehicle, but if it is experiencing rear-end sag, there are a few negatives to think about, including premature wear on original components. A boat is just one example. You may be hauling a motorcycle, a jet ski, or an ATV. This is perfect for the -47, recommended for light and medium duty applications. The -47 is a great solution for Class B and Class C motorhomes as well. The balance of urethane and air bubbles is appropriate for medium to heavy duty applications. An example here might be a Mercedes-Benz Sprinter based motorhome.

Last but not least, the -54. The -54 traps the least amount of air, out of all three densities. This makes for a more dense air spring, suitable for commercial use, or motorhomes on the heavier side. Although SuperSprings are more common in commercial applications, SumoSprings can be an option as well. Using both SuperSprings and SumoSprings is the preferred choice for commercial applications.