Engineered to fit the wheelchairs they are -sion kits are installed by simply removing the fixed axle assembly and replacing it with the QuadshoX system. Kits can be added at the time of wheelchair assembly or can be retro-fitted to an existing chair. The suspension kit is designed to reduce the pain and discom-fort endured by people who use manual wheelchairs to navigate adverse terrain. QuadshoX reduces whole-body vibration by up to 25 percent; ask for details of a Colorado State University study on QuadshoX.