Roller-type chain for bicycles having outer link plates and inner link plates, in each case having - an inner surface of the link plates (3, 4) and an outer surface of the link plates (3, 4), which also constitutes the outer surface of the assembled chain; - two end regions each with a round outer contour and with a cylindrical hole which is arranged substantially concentrically with respect to the round outer contour and which has in each case a geometrical hole axis, and - having a longitudinal plane through the hole axis of the holes situated in the two end regions, - having a transverse plane which constitutes the plane of symmetry with respect to the hole axes of the holes situated in the two end regions, - having a connecting region which connects the two end regions, with a first outer contour, which is concave, on one side relative to the longitudinal axis and with a second contour on that side relative to the longitudinal axis which is situated opposite the first outer contour, - wherein a first marginal spacing between the first outer contour of the connecting region and the longitudinal plane is equal in size to the ring spacing, measured in a direction parallel to the transverse axis, between the margin of the hole and the round outer contour of the end region, wherein a second marginal spacing between the second outer contour of the connecting region and the longitudinal axis is larger than the first marginal spacing at least by half the hole radius of the hole, wherein the second outer contour adjoins the round outer contours of the two end regions and has a straight profile, wherein the second marginal spacing is equal in size to an end-section radius of the end regions, characterized in that the chain ring formed by way of connection of the two ends of a chain piece to one another has a ring inner side and a ring outer side, and the in each case straight second outer contour of the connecting region of the outer and inner link plates (3, 4) faces towards the ring outer side. - an inner surface of the link plates (3, 4) and an outer surface of the link plates (3, 4), which also constitutes the outer surface of the assembled chain; - two end regions each with a round outer contour and with a cylindrical hole which is arranged substantially concentrically with respect to the round outer contour and which has in each case a geometrical hole axis, and - having a longitudinal plane through the hole axis of the holes situated in the two end regions, - having a transverse plane which constitutes the plane of symmetry with respect to the hole axes of the holes situated in the two end regions, - having a connecting region which connects the two end regions, with a first outer contour, which is concave, on one side relative to the longitudinal axis and with a second contour on that side relative to the longitudinal axis which is situated opposite the first outer contour, - wherein a first marginal spacing between the first outer contour of the connecting region and the longitudinal plane is equal in size to the ring spacing, measured in a direction parallel to the transverse axis, between the margin of the hole and the round outer contour of the end region, wherein a second marginal spacing between the second outer contour of the connecting region and the longitudinal axis is larger than the first marginal spacing at least by half the hole radius of the hole, wherein the second outer contour adjoins the round outer contours of the two end regions and has a straight profile, wherein the second marginal spacing is equal in size to an end-section radius of the end regions,