Types of rolling bearings. Installation space and bearing types. The design space allowed for rolling bearings and their periphery is limited. The bearing type and size must be selected within its limits. In mechanical design, the shaft diameter is usually determined first, so the selection is mostly based on the inner diameter of the bearing. Rolling bearings have many size series and structural forms to achieve standardization, from which the most suitable bearing type can be selected. Load and bearing type Comparison of bearing types will indicate the basic load rating of the bearing capacity and the resulting axial load capacity. Comparing bearings of the same size series, roller bearings have greater carrying capacity than ball bearings and are suitable for working conditions with impact loads.