Abstract Although most rolling element bearings are grease lubricated. the underlying mechanisms of grease lubrication has not been fully explored. This study investigates grease film evolution with glass disc revolutions in rolling elastohydrodynamic lubrication (EHL) contacts. The evolution patterns of the grease films were highly related to the speed ranges and grease structures. https://www.roneverhart.com/Calvin-Klein-CK21501-Eyeglasses-SOFT-TORTOISE-Clear-demo-lens/