I HATE driving anything but a 4x4 in the winter time...  I used to work for a delivery company that uses Freightliner FL60 trucks and they suck BIG TIME in deep snow...

Me and my Sidekick even smoke by Subaru Imprezas in the snow....lol

Anyone with ideas on the vibration?  I too the pressure down to 30 PSI for each tire.........its still there. :-/

Whats it say inside your drivers door for tire pressure?

My X90 says inflate to 23lbs so you may still be too high.

26 psi front and back.   Funny thing is, I ran the tiger slicks at 35 to firm up the handling and such and I had no vibrations at all.

I am starting to really wonder if I have a bad tire here.

Maybe because its a different tire, you cant run higher pressures? Just an idea.......

Ok, bled off enough air to fill the goodyear blimp........or to put it another way, about the same amount Mike Hagen had on his romps thru the air...........but I digress.

Down to 26PSI now and I just got back from going down rt 8 at steady 40, then 42 then 45.........keeping in 4th .
The vibration is still there but more "muted" I guess.  The rig goes in tomorrow to get the AC condensor replaced and while its up on the lift, might have them spin the wheels and see if there is an ugly bulge on a  tire somewhere.

Otherwise, I guess its back to the Cooper dealer and ask, "What the ****"  

First go around with Cooper tires,  if they suck this bad, it may be my last.  Problem is, not too many other choices out there for a good snow tire in 215 65r 16

fed x here has four wheel drive vans!! tell them they should keep up with the jone's  lol.

WE CANT EVEN GET A SNOW TIRE, LET ALONE 4X4  THEY RUN THE SAME TIRES YEAR ROUND AND EXPECT YOU TO BE ABLE TO DO THE SAME WORKLOAD SNOWY DAY OR NOT  

Maybe it's because the thicker tread is causing the noise/vibration?

Hamster,
I bet it's the tire. I am having a vibration out of one of my brand new Cooper tires. They have re-balanced them twice, checked the allignment, tried to blame it on a brake dragging, tried to blame it on my wheel spacers, and it's the damn tire. I told them during my last trip to shop that I expected a replacement for it if the re-balance did not work this time, and guess what? It did not work again. The last set of coopers I had were great tires and lasted a long time but this experience is starting to make me think twice about buying them again.
Zig

Called the Cooper dealer today  he says either incorrect balance or possible bad tire(s).  Very accomodating and wants me in as soon as I can and he will take care of it.

Back when I was a petroleum transfer engineer, when balancing a tire I remember if the rim was really shot or the tire had heavy spots, it would  take 2.5 to 4.0 oz weights to compensate.  Last night I did check outside and inside of all 4 wheels and no weight is larger than .75 oz.  

I'd say tire also.  Had a problem w/ Pirelli Scorpian A/Ts on a 2500 Suburban.  re-balnced twice 2 different shops and both said the wheels were bad (Bull***). Pirellis wore out, now it has Uniroyals, no vibes same wheels.  The tires just sucked.

I work at a tire shop and can testify that Coopers suck. If you want quality try Bridgestone nobody ever complains about them. Except price. Cheap zuki owners!  

Or buy some Swampers!

Mike

Shed somelight on this if you can mike....what have you seen at your tire shop.....I did a ton o' research on cooper and really didn't find anything bad, sure they've had their recalls and stuff but nothing that raised a red flag tome.

If you look at the tire as it is spinning on the ballancer
and you watch the tread, does it have any bumped spots
or lumpy spots??

I've seen tires shaved for racing, where you want tread but
not too much and you don't want old used tires, if you see
lumps, look into getting the tread shaved, not too much, just
enough to true up the tread, if they still run rough, I dunno
what to tell you.  Lower the PSI to 23 or 22 it helps soften
the ride, I run 13 PSI in 31s front and rear.

Shaving!  YIKES.......naw, I will stick to shaving my beard though!