1.The noise of ball bearings is lower than that of roller bearings; Bearings with relatively little sliding have lower (friction) noise than bearings with more relative sliding; Bearings with more balls and thick outer rings have lower noise;

2.The noise of bearings with solid cages is relatively lower than that of bearings with stamped cages;

3.The noise of bearings with plastic cages is lower than that of bearings with the above two cages;

4.Bearings with high precision, especially which use higher precision rolling elements, the noise is lower than that of low-precision bearings;

5. The noise of small bearings is relatively smaller than that of large bearings.

Of course, this is the case in theory, but there are many factors that affect the size of the noise in practical applications.