Needle Roller Bearings have a high capacity for loads whilst also being able to cope with higher speeds. They are slim in design and able to accommodate tighter spaces.
In situations where the shaft cannot be used as a race way then the bearings come with inner rings.
The are also Caged needle roller bearings that are designed to permit rotating speeds and have the ability to cope with radial loads. A publication called the Engineer talks about the advantages and some of the history surrounding the needle roller bearing.