O.K. I'm running 285/60/18 Nitto Terra Grapplers. I've had them 13 months, about 15,000 miles. A couple of weeks ago I started noticing a vibration when I got over 20 mph. The first thing I did was go to Dicount Tire and had them rebalence them. It got a little better but not much better. I then thought it might be internal. I took it to a place that used to be an Isuzu dealer. The same Isuzu techs are there, but they no longer sell Izusus. Anyway, they ran a diagontic. They couldn't find anything wrong. They didn't charge me because nothing came up, but they speculated it was the tires. I then went to another Discount Tire. They rotated the tires. It was still the same. I felt comfortable going 55-60 mph. Anything more than that it got too load. They then sent me to still another Discount Tire where they had a this special machine that would really balance them. It's called a Road Force Balancing. After they did that it did help. I felt comfortable going 75mph, after that I didn't feel safe. Usually 90 mph and it rides really smooth.

Here's my problem. The last guy that balanced my tires tells me....."You know those tires are too big for that rim." Now, I know if you punch in VehiCross in the Discount Tire computer it says anything over 245/55/18 cannot fit. Now does that mean that the wheel is too small for anything bigger than that or Izusu wants a smaller tire for a smoother ride?

I've been running 285/60/18 for over 5 years. Did my tires suddenly go bad and shoud Discount replace my tires.

What your take on this?

Peace.
Tom
012009