This pair of replacement wheels is designed for manual wheelchairs, transport wheelchairs, companion chairs, push wheelchairs, and knee scooters. Each wheel has an 11.8 in. Dia, a 2.18 in. axle head length, and a 0.47 in. bearing hole diameter, making them compatible with frames that match these exact measurements. The polyurethane tread offers quiet rolling and resistance to flat spots, while the polypropylene hub provides lightweight strength and impact resilience. Sealed 6201 bearings ensure smooth rotation and long-term reliability under typical indoor and outdoor use. Installation requires only basic tools included in the accessory pack: bolts, a socket wrench, and an open-end wrench. These wheels are not rated for electric wheelchairs due to torque and load limitations. Tire width measures 1.73 in., supporting stable contact with varied surfaces including carpet, tile, and smooth pavement. Proper fit depends on verifying all 3 critical dimensions—wheel diameter, axle head length, and bearing hole—before mounting. They deliver consistent performance without air inflation, noise reduction, or frequent maintenance.