vibration

[mjmmessina]

I have a 07 Sequoia that rode like a sedan ( very smooth) and then I gently hit a curb in the parking lot with it and then noticed a vibration. I take it to the Toyota Dealer and they do a alignment and wheel balance. They tell me that everything is aligned and wheels are balanced and not bent but I'm still feeling a vibration after 2 visits to the dealer. I've taken the rim off that struck the curb and replaced it with the spare and I'm still having the vibration problem. Dealer is telling me that it may be a tire issue but the tires where riding fine when I struck the curb ( 50 miles ago) I'm taking it in for the 3rd visit to the dealer Sat. Any ideas

[DJ]

It's likely that you bent a wheel. It can be balanced, meaning its center of mass is on its center of rotation, and yet still produce considerable vibration if it is no longer "round while rolling."

I suggest finding a shop with a GSP9700 Road Force Measurement System, which can measure the roundness of the wheel/tire assembly while its under load. You can locate a GSP9700 near you quite easily.

[mjmmessina]

That is what I thought so I took the tire and rim off that I hit with the curb and replaced it with the factory spare tire / rim and still have the vibration problem after taking it back the second time. I checked and the dealer has the hunter road force balancer but I'm not sure if they used that to balance them.

[mjmmessina]

ok, after three trips to the dealer and an alignment, balance, roadforce balance, and rims checked for being bent. The dealer decided that the Dunlop AT/20's where the problem. They replaced them and rebalanced them and I still have a vibration even with the new tires. It still feels like the wheels are slightly out of balance. I'm considering trying a different Toyota Dealer or purchasing new Michelins. Any Ideas?????