A special type for mainly radial loads can be set up with just two race rings.
This design can withstand high radial loads but no thrust loads.
As example, a wheelbarrow wheel supports radial and axial loads.
A flat disk is thus strong for radial loads in the plane of the disk and also for torques.
The latch mechanism has to prevent opening under radial loads of up to hundreds of tons.
P is the radial load per unit of project bearing area (Pressure)
The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads.
The larger the contact angle (typically in the range 10 to 45 degrees), the higher the axial load supported, but the lower the radial load.
This design works with radial and thrust loads.
Skateboard wheels each contain two bearings, which are subject to both axial and radial time-varying loads.