Royce Hubs are virtually indestructible and are designed to be able to cope with even the toughest of conditions. Our Hubs are supplied with all weather seals for durability. The Mid Flange shell diameter is 52mm and is drilled in 12.16, 20, 24, 28, 32 hole. Spindle can be for dropouts of 100 or 110mm. Please state when ordering.