Basically this is tire rack awesome and very space-saving. The vertical U-shaped rail (500mm), which must be fastened with three big screws on the wall, falling right from narrow, so that the screw heads with suitable special tool can still be rotated in the wall. Between the screw head and the side U-cheeks can only be reached with a correspondingly thin / small ratchet head. With the associated small ratchet handle can only be bad the screws really tighten. If the rail a little wider, then you would have no problem here.
The description for the assembly of the tire rack could have been more extensive and clear. Overall, I can therefore only awarded 4 stars.