Can't Balance My Rear Tires (New P Zero's) - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

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Old 12-13-2005, 06:28 PM   #11
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I just bought some Pirelli Pzero Nero Z Rated tires last week (heck of a deal too!). Man I love these tires. Quiet and smooth to over 100MPH. Maybe they jacked up a rear rim somehow on the installation of the new tires? I kow it'* been asked but have you tried roatating the tires to the fornt to see if the shimmy shimmy shake shake transfers as well?
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Old 12-13-2005, 06:52 PM   #12
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Getting ready to try that with the new tires, although when I flipped the old rears a few weeks ago (before the exchange) the symptom remained. I run 30-32 lbs pressure, but seems like things smooth out a bit with 35+ lbs. but I don't like the frame quakes I get on potholes at that pressure.

Regarding an earlier post about the red dots on the sidewalls, I looked and found only one rear tire marked with a red dot. The stem is mounted opposite of that. The other tires have no red dots but the balancer marked the other three sidewalls with yellow chalk. Don't know what that was all about.

One thing I noticed today. On a familiar road I noticed that at 70mph and above the vibration from the rear was actually oscillating.... like for 15 seconds or so it would start to vibrate, then smooth out for about the same time, then start the cycle all over. Some kind of harmonic or something. As soon as I back her down to 69mph and below, smooth and slick as snot on a doorknob.

I will say one thing; these Pirelli'* run like tank tracks in deep snow. I am very surprized at the tracktion. They will climb our steep drive with absolutely no wheel spin. My old RSA'*, even with good tread, cause me to park the SSEi at the bottom of the drive after a big snow. Around here about 4-6".
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