Tapered Roller bearings

are conical rollers that run on conical races.  Roller bearings only take radial loads, but taper roller bearings support both radial and axial loads, and generally can carry higher loads than ball bearings due to greater contact area. Taper roller bearings are used for the wheel bearings of most cars, trucks, buses, and etc. Due to manufacturing complexities, tapered roller bearings are usually more expensive than ball bearings.  Additionally under heavy loads the tapered roller is like a wedge and bearing loads tend to try to eject the roller; the force from the collar which keeps the roller in the bearing adds to bearing friction compared to ball bearings.