DadsKR150

2010 King Ranch 4x4 5.4. When truck was brand new it had a bad vibration (flat spots apparently). Dealership replaced 3 tires. Vibration better but not gone (primarily at 70 - 80 mph). Dealer said drive it for a while, it will get better. Now at 3000 miles, it's still there and annoying as hell. With my schedule it's a real pain to take it in, but no choice at this point.

Anyone else have this issue with this wheel/tire combo?

teamroper

My wife notices flat spot vibrations for a few miles, then it smooths up, this is only if it sits for a day or two without driving it?

I've read where several people have this problem with the Pirelli's.

Klomax23

I agree. I experienced vibration after sitting for a while. Usually in cold weather. It goes away after about 10-20 highway miles.

modiecast

No issues here, even when cold and sitting for days. Maybe they need to replace that 4th tire.

09KingRanch

My '09 KR with the 20" Pirelli's runs smooth and vibration free. I would stay on the dealer until they fix it.

woodeye

I agree with King, stay on your dealer!
For me, I have an '09 SCrew, and I have put 9,000 miles on my Pierlli's with no issues. Not only are they a smooth ride at freeway speeds, but I live in Minnesota, and I was VERY happy with the handling & traction that I had in the snow this winter.

JRide

I have the 20" Pirelli's and I also get the vibration at first. It doesn't bother me though. The tire is just stiff when cold. Once it warms up its fine. I really like the way the Pirelli's ride/perform.

I will say my vibration only lasts for about a mile then its fine.

big_ole_truck

The Pirelli tires flat spot overnight. Not much you can do about other than get a different brand of tires. You typically have to run a couple of miles for the tires to get back to round.

Once the tires are round, they should be balanced.

UpSet

I purchased a new 2010 F-150 fully loaded two days ago and started a 850 mile trip the first day. On day two at about 400 miles I stopped at the nearest ford dealer to have my tires checked for balance that is when I was made aware of a technical service bulletin addressing the vibration while accelerating or running at 70+ mph. I called the dealer where I bought the truck and made them aware of the problem, they will inspect it on monday. After finding this site I am convinced this is a common problem and they will probably not fix it. I had terrible issues with my Lincoln MKX which I traded for this $46000 truck. Dont think I will be getting any sleep tonight worring about what I have done.

schaibaa

Mine is in for this too ... although I don't think it's tire related, I'm thinking it's more drive shaft.

Take it in until they fix it, and if they can't/won't - lemon law them.