Deflection or tensioning roller of a belt drive of an internal combustion engine

The roller has a passage for a fixing screw (40) or other fixing element. The part of the screw to fit through the passage is seated in an elastic holder ring (50), which prevents the screw from falling out. A ball bearing (38) is preferably arranged in a pot-shaped holder (36), which has an opening with a section (46) having a holder for a spacer bolt (44) and another section having a holder groove for the holder ring.