Derailleur hanger

A bracket element configured for installation on an axial inner side of an associated rear bracket portion of a bicycle frame for the purposes of installing a rear gearshift mechanism of a derailleur system on the bicycle frame, comprising:

• a first portion, which has an opening or aperture assigned to an axle and which, in an installed state, is subjected to a clamping force which acts between rear bracket portions, a second portion having an installation opening which is radially offset in relation to the opening or aperture in the installed state with respect to an axis and to which an attachment end of a base element of the rear gearshift mechanism is fixable,
• wherein the bracket element includes a first side and a second side, an abutment surface of the second portion on the second side, which the abutment surface of the second portion surrounds the installation opening and is provided for forming a support surface for the attachment end of the installed base element, is offset in relation to an abutment surface of the first portion on the second side, which the abutment surface of the first portion surrounds the opening or aperture on the second side of the bracket element, said offset being in a direction towards the first side of the bracket element, wherein the abutment surface of the first portion is configured to at least partially abut the bicycle frame.