Specifications Wheel Diameter (mm) 200 Tyre Width (mm) 35 Boss Width (mm) 64 Axle Diameter 1/2 inch Wheel Bearing Type Roller Maximum Load Capacity (kg) 200 GRY RUBBER ON NY The RN8876-50 from Richmond Rolling Solutions is a 200mm diameter rubber tyred nylon wheel and has a tyre width of 35mm.The following Richmond castors use this wheel (not necessarily with the same axle diameter) S8050, S8050B.The axle diameter is 1/2 inch (12.7mm) and this wheel is available for the following alternative axle size: 20mm.