Unless I go pay an astronomical amount for high-speed balancing, most of the shops only spin 'em up to around 50-60mph when balancing. If I have a vibration on my DD, it ususally starts just shy of 60, but levels off around 70-75mph. My 1st set of lows I bought, I was making good side money and went to this place that I think is the highest in the ATL area. They do lots of celebrities cars and work for race car drivers and high end exotics, so I figured they could definitely get my Maxima right. Paid about $1100 for (4) Pirellis and the balancing and maybe an alignment...can't remember. I could run that thing straight up to 135mph w/no shaking at all, so I guess it was worth it. However, I've never paid for that again since!