SumoSprings Compress up to 80% of original height with full memory rebound and stretch 50% of their height.
They are maintenance free, do not leak air, and do not require airlines or compressors.. SuperSprings SumoSpring Air Helper Spring Set - SSR-601-47 SumoSprings are a patented suspension product designed to enhance load carrying ability, stabilize sway, and improve overall driver control and comfort. SumoSprings Rear for Nissan NV200, Chevrolet City Express;Sold as a pair (left and right);Maintenance-free;Enhances load carrying ability;1500 (lb) capacity at 50% compression;Reduces and stabilizes sway;Improves overall driver control and ride comfort;Compress up to 80% of original height with full memory rebound;One-piece unit attached on top and bottom allows up to 50% expansion of original body height;Progressive spring rate with superior damping properties;Made from patented micro-cellular urethane;Will not leak or rupture;Never load any vehicle beyond the manufacturer's GVWR;California Residents: WARNING SumoSprings are manufactured in a variety of heights, diameters and densities to support multiple front and rear applications.