I have the same issue after I put on my 1" bora spacers. I felt a vibration about 65 - 75 mph. I have factory wheels and brand new tires so they were just balanced. I rotated the tires just to make sure there was something I was missing, but the vibration was still there. I also had them re-torqued to make sure they didn't come loose or move. Still no luck. I reached out to Motorsport Tech to see what the next steps were and they advised me to send them back to have them inspect the spacers. They should receive them back today and hopefully I will have more information tomorrow. I noticed when the spacers were removed, there is a small rubber o-ring around the hub. Can anyone tell me if this is supposed to be removed prior to install? See attached picture.