Solid Tyre Wheelchair Replacement Parts 3.00-4 Is Mainly Used For The Wheels Of Electric Wheelchairs and Mobility Scooters. Its Tire Consists of Two Parts: Rubber Outer Tube, Microcellular Polyurethane Elastomer Filled or Inserted inside. The Brand Of Rubber Tires mainly is Innova. Its Max. Loading Is About 75KGS per Wheel. We can also custom