The rack rattles a great deal even when everything is tightened. I had to use paperclips and rubberbands to tighten things up. Yakima sent me an extra piece which didnt help. The rubber pieces, that hold the bike, slide around as well which can put pressure on the rubber ties. I had to use duct tape to prevent them from moving. it is very difficult to carry 4 bikes on this rack. This rack is easy to put together and take off although it does not come with a lock.