I'm having an issue with a high speed vibration over 60mph. It's not bad, but noticeable. I was initially told by Discount Tire that I had a bent rim on the front, which they replaced, but that was not the issue. I've also noticed that when going up a hill around 30mph it also has a weird stutter/vibration. I've ordered a tube of shutter fix and will try that, but does anyone else have any ideas?