Union Geardrop 

Model: GH-242

Fits several different brands, e.g. B'twin, GT, Haibike, Hercules, KHS, Mondraker, Mongoose, Radon, Sinus, Staiger, UMF, Winora

Always check the picture and the design of the geardrop in relation to your current geardrop to see if it will fit on the bike.