Roller bearings extend the working life of wheels, pulleys, fans, pumps, compressors, and other rotating parts by reducing friction and enabling parts to move smoothly. They have a wide, flat bearing to provide stability in high-speed applications with high radial loads. Radial loads exert force across the diameter (radius) of the shaft, such as those exerted by the load supported by a pulley or wheel. Tapered roller bearings, cylindrical bearings, and combination bearings support axial and radial loads, such as those encountered on vehicle axels where there force is both through the wheel and along the wheel axis. Needle roller bearings support high speed, high radial loads in confined spaces. Spherical roller bearings support heavy shock loads where misalignment is a risk, such as wind turbines, pumps, paper processing, and fans. Tapered roller bearing cones and cups support high radial and axial loads and are used for such things as axels and gear boxes.