I've got a 2003 Silverado K1500 w/42,000 miles. I just replace the tires. OEM size was 245/75/16. Installed a 265/75/16 LT series. I noticed a vibration that started at about 35mph and seemed to go away at around 70 being the worst at about 60-65. Took the truck back to where I had the tires installed and they rebalanced them and said I had "a very badly bent rim". I took them at their word and ordered another rim from the dealer (standard, steel rim - nothing fancy) The new rim came in a day or two later. I took it back to the tire installer and told them I wanted to see the bent one before installing the new one. They couldn't find one they thought was bent. They balanced a third time. No change. Went back to them a 4th time demanding that it be fixed. Balanced them AGAIN. Every time, they've found at least one or more out of balance. This time, they were able to show me that TWO tires weren't tracking straight - just looking at them on the balance machine. However, only one rim appeared to be even slightly less than true. Ordered in two more tires. The tires hadn't shown up by last Friday and I had a 1000 mile trip over Memorial Day, so I insisted that they install 4 new tires. They installed a P-metric tire from the same manufacturer and replaced what they said was the worst rim. No change. Went to a local branch of the same store when on the road figuring maybe alignment was the problem. They talked me out of that saying that alignment couldn't/wouldn't cause vibration and balanced them again, finding one out of balance.
At this point, I've got one new rim, two new sets of tires that have been balanced a total of six times and a vibration that no one can seem to cure.
There was no problem whatsoever until the tires were installed.
Two questions:
1) What could it be? 2) Could they have caused it?Thanks.