Mike1Six

I have a new set of 19" AMR wheels with Pirelli-zero's 245/45 size tires (all 4 corners)

This just went on yesterday, Wheels were torqued down to 100 ft-lbs. Front tire pressure is set to 38 PSI and rear at 36 PSI

After installing them there is a noticeable harmonic drone starting at about 25 MPH and increases with speed. It sounds as if it is coming from the front driver side of the car.

I've gotten the car up to highway speeds (75 ish) and do not notice any vibrations. The ride is actually pretty smooth.

The car is a 2014 with about 12,000 miles on it. It's too new and too much of a coincidence for me to think a wheel bearing has gone bad.

That's Problem number 1....

I also can't get the TPMS sensors to sync. Getting into sync mode is the easy part. Sensor button does light up. I have not tried deflating then re-inflating yet. That'll be my next step.

Any ideas?

Mike1Six

Just lowered PSI on all corners to 35 PSI. Still get the drone and steering is alot more sensitive.

Are the Pirelli's just giving off road noise that I'm not used to or potentially a bad balance job?

Also, does anyone know if these tires are directional? I didn't see any arrows indicating they were but the have a weird tread pattern... kinda looks like this ~||~.

**Edit** Found out the tires are not directional, but they are marked inner and outer. I double checked to make sure they were mounted correctly and all 4 show "Outer" on the side wall.

Norm Peterson

Could be that these tires are more sensitive to camber settings as far as noise is concerned. There are ways to DIY-measure camber.




Norm

jeffo

TPMS issues -
1. I would keep the tires at 36-38lbs, that is about correct.
2. Try holding the syn tool directly beside the valve stem hole. The battery may be weak.
3. As you stated, deflate, inflate.

Tire noise. If coming from just one, it could possibly be a flat spot in the tire from storage too long, or could just be a bad tire. Try riding on it for 100-200 mile and see if it gets better.

Norm Peterson

If they're these tires, then the tread pattern does suggest if you're running cambers that are much more negative than "stock" (-0.75°) that they could be noisy, but that would be both front tires assuming that the cambers on both sides are about the same. However, from the driver seat you're more likely to hear the driver side.

If your OE tires were either 215/65-17 or 235/50-18, you can set the 245/45-19's to the same pressure that they were supposed to be inflated to. However, you can improve handling slightly by running the front tire pressure up 3 or 4 psi from there and leaving the rear tire pressure at the sticker number. I would recommend no more than +4 psi unless you're at an autocross or at a road course track day.

Make sure when you're trying to get the TPMS matter straightened out that you aren't near any other vehicles that have TPMS. Other than that (and noting that the car will run and drive just fine whether TPMS gets synch'ed or not), I have no suggestions.


Norm