Unique and patented. No more stretching to tighten up knobs and to lock to the bike frame, the roof carrier is as simple as it can be. Just push the bike frame towards the arm head and it snaps shut locking itself to the frame. To release there is a ergonomic lever lower down. The automatic locking system makes the carrier ideal for carbon frame bikes and the 360° rotation of the arm head means an easier attach in many different points and allows to mount the bike facing either direction.