US Patent 11230350 Derailleur hanger

A bracket element configured for installation on an axial inner side of an associated bracket portion of a bicycle frame for the purposes of installing a rear gearshift mechanism of a derailleur system on the bicycle frame is provided. The bracket element may include a first portion, which has an opening or aperture assigned to the axle and which, in the installed state, is subjected to a clamping force which acts between the rear bracket portion. The bracket element may also include 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 the axis and to which an attachment end of a base element of the rear gearshift mechanism is fixable.