Car trunk and bumper mount bicycle racks are generally a lower cost, portable, and universal solution to transporting your bike on your car. Trunk and bumper mount racks fit most vehicles, but not all, so it is important to visit the manufacturers website and determine if your car is listed as compatible. The racks are installed with a series of straps designed to hold the rack securely without damage to your vehicle or bicycle, and can fold up when not in use.