Function: 1. 8 inch diameter: The Koło of the 8 inch large diameter wheelchair ensures fast movement with great stability. 2. PU Material: Adopting high quality PU material, the wheel is slip and wear resistant when rolling. 3. Ball bearing: Equipped with a metal ball bearing, the tire allows for smooth rolling and long durability. 4. Thickened hub: The compacted wheel hub is not easy to deform, which also has a high load capacity. 5. Wide application: perfectly fit for wheelchair, walker, rollator and so on, very easy to install. Specification: Item Type: koło Wheelchair Material: PU material Diameter: approx. 197mm / 7.8in Tyre thickness: approx. 23mm / 0.9 inch Wheel Hub Thickness: 50mm/2,0 inch Bearing model: 608zz Bearing hole diameter: approx. 8mm / 0.3 inch Outer diameter of bearing: approx. 22mm / 0.9 inch Bearing thickness: approx. 7mm / 0.30 inch (A slight error may occur in manual measurement. ) List of packages: 1 x koło wheelchair Note: Please adjust the correct size before use.