I drove my New Edge Mustang GT with these spacers for 6 months. At the end of that time I started to drive a lot and vigorously on bumpy country roads and even competed in hill climbs - I completely forgot I was using wheel spacers. When that thought finally crossed my mind, I realized how lucky I was that these things never broke. I would never recommend wheel spacers for anything other than an everyday driver where you want a better fit. However, if you are determined to fit spacers on a high performance car, this is what you need. I'm surprised nothing bad happened.