Abstract: A bicycle lock in the form of a U-lock includes a U-shaped closure bracket and an elongated lock body. The lock body includes insertion openings for receiving ends of the closure bracket, while the ends of the closure bracket are provided with recesses that are parallel to a longitudinal direction of the lock body. Two locking bolts can be moved for securing the closure bracket in the lock body, the locking bolts forming a part of oppositely moveable locking devices that can be moved by a driver that is rotatable by means of a closing cylinder. By actuating the closing cylinder, the locking devices are drivable in the longitudinal direction of the locking body. Each locking device has two sections into which the locking bolts are inserted. The locking bolts are preferably cylindrical.