I held back on this to see what was said. I have owned one of my DPs since 1997 and have replaced the tires 4 times the other one I have replaced them once. All done by the same tire place and not once have they applied a weight and I have never had ANY vibration in the steering or otherwise. Old DP has 110,000+ miles and newer one about 70,000. I asked once and they said that they lined up a mark on the tire...Now this information may not agree with some of you and at first I wasn't sure but it seems to work on my units just fine. These are 22.5 wheels and one has aluminum and the other steel wheels. This is only meant to be an example, you decide what makes you happy.