This is about my '86 pickup. I'd post it at a site more suitable for these pickups, but frankly, I believe all the best knowledge is at the Team Camaro and Chevelle sites.
So here's the problem. It's a 1986 half ton. With the stock wheels and tires, there is no vibration at any speed. Everything is good.
Now, I picked up a set of aluminum slot mags at the swapmeet. 15x10 with 275/60-15 for the rear, and 15x8.5 with 245/60-15 for the front. The front tires had about 10,000 miles left, so I went ahead and drove on them until they needed replacing. However, at freeway speeds (60-70 MPH) there was a vibration felt through the whole truck, including the steering wheel. Kind of a side-to-side shimmy.
I got new tires for the front now, figuring it would solve the problem. I asked the tire guy how they balanced, and he said "Just fine. No problems there." I took it out on the freeway, and the vibration is still there, but a little less.
Did I buy a bad set of wheels? Can a out-of-round wheel balance OK with a new set of tires? Any ideas on this?
Lead Mechanical Engineer
Art Morrison Ent. Inc.