The ramps are great. I have a very steep curb approach of almost 20 degrees! I made the mistake of not bolting the first set I purchased to the ground. First, they didn't stay put when I drove over them, and then that evening, someone stole them. Thank you, San Francisco. I ordered another set, and this time, epoxy and bolting into the concrete worked. Not only did they perform well with my car, which has less than 5" of clearance, but they have not been stolen or taken away by the street sweepers. My car hasn't bottomed out since. I'm so happy I got another set and installed them correctly. I highly recommend countersinking some bolts into the concrete or pavement; otherwise, your wheels will move them around. They are heavy, but they won't stay put if you have a powerful or heavy car.