The two other principal motivations for seeking front suspension by other than telescopic fork are the stiction argument and the pro-dive argument. The telescopic fork moves on sliding bearings, and especially when side-loaded by hard braking, lubricant is squeezed out of such bearings to leave them in a condition of mixed lubrication, part oil film and part surface-to-surface contact. It is characteristic of surface-to-surface friction to stick and slip alternately, as when a heavy crate must be slid across a floor. This stick-slip friction, when occurring in a telescopic fork, has come to be called “stiction.” Such irregular motion interferes with front-tire grip by causing large variations in tire-to-pavement pressure (tires hate that). Pivoted suspensions, of which hub center is one type, all but eliminate stiction, and as one common result display somewhat shorter braking distances.