Conditions of rotation refer to the bearing ring being considered in relation to the direction of the load. Essentially, there are "rotating load" and "static load". For bearings parts that under rotating loads, interference fit is usually used to prevent bearing from slipping or “creep”. Meanwhile, clearance fit may be used in “static load” condition to accommodate certain operating conditions or to facilitate bearing mounting and dismounting.

● Radial load and bearing fit

Illustration	Bearing rotation		Ring load	Fit	Typical application
Static load		Inner ring : Rotating Outer ring : Stationary	Inner ring rotating load Outer ring stationary load	lnner ring : Tight fit Outer ring : Loose fit	Spur gear boxes, motors
Unbalanced load		Inner ring : Stationary Outer ring : Rotating			Greatly unbalanced wheels
Static load		Inner ring : Stationary Outer ring : Rotating	Inner ring stationary load outer ring rotating load	lnner ring : Loose fit Outer ring : Tight fit	Running wheels & pulleys with stationary shaft
Unbalanced load		Inner ring : Rotating Outer ring : Stationary			Shaker sceens (unbalanced vibration)
Indeterminate	Rotating or stationary		Indeterminate direction load	Interference fit	Cranks