A pull-out guide for drawers has a carcass rail, a drawer rail, and a central rail which is moveably mounted between the carcass rail and the drawer rail. At least one carriage is mounted in a moveable manner between at least two rails of the pull-out guide. A synchronization apparatus avoids running faults of the pull-out guide, and the synchronization apparatus has at least one synchronization wheel which interacts firstly with the one carriage and secondly with a running surface which is arranged on one of the rails. The synchronization wheel is in the form of a gear with two pinions with different diameters. The first pinion and the second pinion are connected to one another in a rotationally fixed manner, wherein, when one pinion moves, the other pinion also moves.