modad

2017 Lux with Pirelli Cinturato P7 tires with 25,000 miles on them. I noticed a vibration so I had them Road Force balanced. Tech said 2 were needing balancing. Since then I notice the car still has a slight vibration every time I drive it for the first 5 miles or so and then it is almost completely smooth. The vibration is definitely tire/suspension related as it doesn't matter whether I'm coasting or accelerating; in Drive or in Neutral. It reminds me of the old bias tires after they had set up for a few days and started out-of-round. Any suggestions to the issue?

bclexus

When I was first reading your post the first thing I thought of was what you mentioned in the latter part about the tires getting a flat spot after sitting a while. I have had Pirelli Cinturato P7 tires on a GS 350 and currently have them on another vehicle and have never experienced the condition you describe with the Pirelli Cinturato P7 tires.

What tire pressure are you maintaining? If it borders on the low side of the recommended air pressure, what you're experiencing might very well be the result of minuscule flat spots. I suspect diving a few miles at city speeds, it probably would never be noticed.

modad

Keeping at least 36 PSI and have actually tried 32-40 and there seems to be little distance in the starting miles. My 2nd set of these tires and never had anything bad until this started at about 22-23,000 miles.

bclexus

Modern radial tires will do the same, some more so than others - but i never experienced it with Pirelli Cinturato P7 tires.

Knucklebus

My car does the same thing when it has sat for a few days. Once it warms up, they are fine until I let is sit for a few days again. I think short sidewall tires are more prone to it. My wife's Honda with taller, cheaper tires doesn't do it.

modad

That's the strange part... I drive this car daily; its not after sitting for a few days. And, I've never had this with the P7's before. I thought maybe it was broken belts, knots, or some other issue someone on the forum had experienced as well. I'd consider new tires, but if its not a safety issue it seems a waste. Thanks for replying!

Knucklebus

Is it sitting overnight at least? Or is it anytime it has sat for a bit? Is it all 4 tires? You can tell which axle by where the vibrations are felt, in the seat is rear. In the steering wheel is front.

If it were mine and I had a lift, I'd put it up off the ground and see if it does it afterward. You could also just jack up the front or the rear overnight and see if it is half as bad.

modad

It is sitting overnight (garaged). And, IIR it seems to be felt in both seat and wheel, but I'll try to check tomorrow and determine if it felt both places. Haven't thought of jacking it up and leaving it over night. I've never had this issue before, so a lot of ideas to consider. Thanks!