These wheel assemblies are sized 8x2 inches, also noted as 200x50, and are intended for use on a variety of wheelchairs. The wheel diameter is 7 13/16 inches, with an axle head width of 2 3/8 inches and a bearing bore of 5/16 inch, providing a clear reference for mounting. Other critical dimensions include a screw length of 3 3/8 inches and a tire width of 1 14/16 inches to help verify fit with existing frames. The tire is made from polyurethane, the hub from polypropylene, and the bearing is a 608zz type, described here to indicate material composition and compatibility with standard components. The assembly ships with screws and a small wrench to support straightforward self installation, reducing the need for additional tools. These parts are designed to withstand regular use across indoor and outdoor settings, delivering dependable performance through everyday mobility tasks. When planning replacement, check the mounting points on your chair to ensure alignment with the listed measurements, and confirm that the overall footprint matches the frame clearance. This product focuses on practical fit, durable materials, and simple maintenance, enabling you to refresh a chair's wheel setup without complex procedures. It is suitable for a range of frames that share common mounting configurations and standard hardware interfaces.