I had the same problem on my '96 tacoma and it turned out to be a bent rim. I repleced the suspect rim and had the same problem which turned out to be an out of balance new rim. A rule of thumb is that if the rim requires more than 3/4 ounce of weight to balance it, the rim is defective. Most tire companies will just add a ton of weights to balansce the tire because they just don't know any better or are just happy to have sold you a new set of tires and don't want to tell you that you also need to purchase a new rim. You should check to see if any of your new tires have a cluster of balancing weights on the rim, and if so, then take the vehicle back to the tire dealer and ask them to re-balance the suspected tire and ask them if any of the tires require 3/4 ounce or more weight to balance it. A good clue is to look for the long weights. If you see a long weight, and maybe a long weight and a couple of little ones in the same spot on the rim, there is a problem. You can also tell if a rim is bent if you look at it closeley while it is spinning on the balancing machine. Lemme neaux if the rim is the problemo. <img src="/forums/images/graemlins/nana.gif" alt="" />