1. A belt reel (14) for a belt retractor (10), comprising a rotational axis (R) and a reel body (16) which has a first axial circumferential circle (34), wherein the reel body (16) is configured to be connected directly to the webbing (24) so that the webbing (24) is directly wound on and unwound from the reel body (16), wherein the reel body (16) includes a radial constriction (32) having a second axial circumferential circle (36), wherein the constriction (32) is arranged centrally on the reel body (16) in the axial direction (A) such that the constriction (32) is equally distanced from both axial ends of the reel body (16), and wherein the circumference of the second axial circumferential circle (36) amounts to a maximum of 95% of the circumference of the first axial circumferential circle (34).