A lift cylinder comprises a deflection roller device for an industrial truck. The deflection roller device includes a roller support, a lifting chain deflection roller having a roller axle and a roller body rotatably carried on the roller axle, and a first additional deflection roller arranged axially adjacent to the lifting chain deflection roller. The roller axle includes a cylindrical bearing portion and fastening ends projecting axially outwards on either side of the cylindrical bearing portion and fastened to the roller support. The first additional deflection roller is supported on a first additional-deflection roller support such that the axis of rotation of the first additional deflection roller is offset relative to the axis of rotation of the lifting chain deflection roller, and the axis of rotation of the first additional deflection roller extends through the roller body of the lifting chain deflection roller.