Originally Posted By: IveBeenRued
Originally Posted By: HTSS_TR
Originally Posted By: CapriRacer
Well, that is at least progress.
- BUT -
I am wondering if the wheel might be the source of the problem. Recall that all 3 "bad" tires have been on the same wheel!
Since the dealer you are working with has a Hunter GSP9700, have them do a BARE wheel measurement. Contrary to what the machine says, the wheel ought to be below 0.15".
- AND -
What's the next step? Is Pirelli going to replace that tire a third time? Are they going to give up and do a complete refund?
I think what you're suspecting is probably correct.
Pirelli isn't a no name China tire manufacture, it seems very unlikely all the problems so far are with the tires.
Please see my previous post. As indicated, my wheel is less than 1/10 of the threshold that would be indicative of having a wheel issue and 1/42 of the reject threshold for Ford's wheel manufacturing. I have also had two independent dealers determine that this is a tire issue and not a wheel issue. In addition, a wheel issue would not explain the wandering tread that the tech witnessed on both replacement tires and the original.
Prior to this issue, this car had the smoothest ride I had felt since my uncle's Cadillac which was a big driver for buying the vehicle.
The Pirelli dealer themselves say that they have not stocked nor have they recommended Pirelli within the last 5 years due to manufacture defects coming out of their Mexican plant and because of how much of a pain the warranty claims are for them.
Opps! I forgot a zero in my post. The value I wanted to post was 0.015", not 0.15".
So 0.012" is close to the upper limit.
Plus, the Hunter GSP9700 has a built in upper limit for wheels at 0.026", which I think is way, way too high!
Further, the Ford upper limit is somewhere in the 0.010" range (or lower!)
Oh, and I am using the first harmonic as the value, not the peak to peak (aka composite). And just for reference, 0.001" (yes, that's a thousandth!) = 1# Road Force, so your 14# tire should have been completely offset by the 12# wheel.
So I still kind of think your wheel is part of the problem. And I wonder if your current dealer really understands what is needed to fix this problem - given that a 14# tire + a 12# wheel = a 2# assembly!