This mounting bracket is already included when you purchase a Bobike mini seat. If you want an additional bracket or need a replacement, this is the spare part you need. This bracket fits standard steering tubes Ø 22-32 mm and MTB bikes steering tubes: 1-1/8”. Meets EN14344 safety standards

The measurements of the universal bracket are: 10 x 8 x 3,5 cm or 3,94 x 3,15 x 1,38” (wxdxh).