Black Vs. Blue SumoSprings Bump Stops: What’s The Difference & How To Choose

When it comes to bump stops, you probably have heard of SumoSprings. SumoSprings are the bump stop lineup manufactured by Super Springs International for various vehicle makes and models.

Stock bump stops are usually made of a hard, unforgiving rubber and are designed to limit suspension travel and prevent metal-to-metal contact between the suspension components. They are a standard component on most vehicles and are designed to provide a comfortable ride while avoiding damage to the suspension.

SumoSprings bump stops, on the other hand, are a more advanced type of bump stop that is designed to provide additional support to the suspension when it is under heavy load or during aggressive off-road driving. They are made of a heavy-duty material such as polyurethane and are designed to compress more slowly and resist bottoming out better than stock bump stops.

In terms of performance, these bump stops are generally considered to be superior to stock bump stops for off-road use. They provide more predictable and controlled suspension compression, which helps prevent damage to the vehicle and offers a more comfortable ride. I’ll be shedding some light on two different offerings for the 4Runner platform offered by Super Springs International. If you need a detailed overall review of the product and installation process, please check Brenan’s SumoSprings bump stop install/overview post.

Find It Online

• SuperSprings SumoSprings: Check Price

Alternative Option (DuroBumps):

• Front & Rear: Check Price

SSI Bump Stop Overview

Front Suspension Details – SSF-604-40

The SSF-604-40 has a 1,400 lb. capacity when compressed at 50% which is plenty for your full-length steel bumper and winch setup, in addition to the front end. This model comes in blue.

SumoSprings recommend not to compress them more than 70% of their original height to maintain full memory rebound. The front end has only one offering, which will handle just about any setup.

Rear Suspension Details – SSR-623-40 (blue)

Like the blue front ones, the rear ones have the exact specifications and thereby come in the same blue color offering. The SSR-623-40 has a 1,400 lb. capacity when compressed at 50%. The Blue SumoSpring shouldn’t be compressed past 70% of its original height to keep full memory rebound.

Alternative Option: SSR-623-47 (black)

These are a more heavy-duty option and are built out of denser material. These are offered in black. These have a 1800 lb. capacity when compressed at 50%. The compression on these shouldn’t exceed 65% of their original height to keep the full memory rebound.

Features and Specifications

• Maintenance-free, so no air leaks and no need for compressors
• Reduce and stabilize body roll
• Enhance towing and load-carrying characteristics
• Easy installation with basic hand tools
• Replace factory bump stops with no additional modifications required
• Made in the USA
• Improves ride comfort by decreasing vibration and softening harsh rebounds
• Handmade from micro-cellular polyurethane
• Not a rubber piece but a progressive spring with a very soft initial engagement
• Reduces rear-end sag

Choosing Black vs. Blue

The blue SumoSprings are made from a softer-density material, which requires less weight to compress, resulting in a softer unloaded and loaded ride. The black SumoSprings have a higher density, meaning more material is packed into the same size SumoSprings, which in turn requires more applied weight to compress them. This is what gives the black version a higher load rating, but also what creates a stiffer ride.

The blue SumoSprings are designed for light to medium-duty applications, providing additional support and cushioning to the suspension system. They are typically used on vehicles such as SUVs, vans, and pickup trucks, and are ideal for those who want a more comfortable ride with a little bit of extra load-carrying capacity.

The black SumoSprings, on the other hand, are designed for heavy-duty applications, such as larger trucks and RVs. They offer more support and cushioning than the blue SumoSprings, and are capable of handling heavier loads without bottoming out.

In my opinion, from my testing, for the rear end with the aftermarket metal bumper and loaded trunk space with camping supplies, the blue option will be adequate.

The black option is designed for the units that are loaded constantly and tow a lot. If your 4Runner is equipped with a heavy-duty rooftop tent, a metal rear bumper, and a drawer system, and you pull a small trailer (or something similar), I would opt for the black option.

One thing to note here is that the Blue SumoSprings will be adequate for likely more than 90% of the 4Runners out there. The ride will be as close as to the stock when unloaded for your daily commute and chores and, will be stabilized according to the weight when the vehicle gets loaded for overlanding and camping setu p.Everyone’ss setup is different for the rear as many options need to be accounted for, such as drawer systems, rooftop tents, rear bumper with single or dual swing-out options, spare tire, jerry cans, etc. In general, the choice between blue and black SumoSprings bump stops depends on the specific application and the weight of the vehicle. If you have a lighter vehicle and don’t need to carry heavy loads, the blue SumoSprings may be sufficient. If you have a heavier vehicle or plan to carry heavy loads, the black SumoSprings may be a better choice.

Again, the key takeaway here is that unless you consistently carry a very much above-average load, the black option will likely be too stiff for you. Blue is the safest default choice. We have seen a few people try the black version, with relatively heavy setups, and they ultimately settled on the blue version—something to think about.

Final Thoughts

These were a welcome addition to my lifted 4Runner, as the stock ones weren’t cutting it with the extended-length shock travel. I could immediately feel the difference in the ride after the installation was complete. The body roll is much less noticeable with these, which inspires driver confidence on the road for sure.

Off-road, these felt great as well. As with stock bump stops, I used to hear a loud thud when the axle contacted the bump stop while articulating, but not anymore! SumoSprings feel significantly smoother when in contact with the axle, and you can sense that they are doing their job.

Overall, with these installed, you can feel an increase in comfort, way less body roll, and more stabilization both on and off road. I haven’t towed a lot with these, but I’m confident the rig will feel much planted and stable when I put these to the test.

Lastly, the blue setup will be more than sufficient for moderate to intermediate builds. But, if your rig is super heavy from front to rear and you have ample weight on your roof and tow frequently, the black option is for you.