One of the fastening knobs that hold the bikes to the rack broke as i was simply tightening it, which did not take much pressure to break it.. also the rope snapped while going over small bumps. It was a hassle to put on and take off. Additionally, the bikes were not very secure while i was driving.. I was very disappointed with my purchase, this product was clearly defective. Now i will have to hassle with a refund and buy another one :(