Abstract: A photographic film cartridge having a spool (1) which is rotatably mounted in a cartridge casing (3) and on which a film strip is wound in the form of a film roll (2), wherein the film can be moved out of the cartridge casing in the direction of unwinding by turning the spool, comprises (a) flanges on the spool, the face of which flanges which is oriented towards the film roll is at a distance from the film roll which becomes less from the inside (axis) to the outside (periphery), so that the film is clamped at the outermost periphery of the film roll, and (b) encircling ribs, which merely expose the region of the cartridge mouth, on the inside of the cartridge casing in the region of the edges of the film roll, which ribs prevent a radial expansion of the film roll.