Looking for leads on a vibration

[TheGetawayCar]

Hello, I don't post here much but I thought I'd go wide on my search for a cause to this vibration.

So, I got new 225's fitted this morning in place of the 205 snows (finally!). I had been feeling a vibration at mid-speeds and chalked it up to some bearings and horribly choppy winter tires. However even after the new tires, it's still there.

It feels almost like sunroof buffeting and I mostly feel it in my butt. It vibrates the armrest in the up position. It's wheel-speed dependent as coasting in neutral doesn't affect it and neither does engine rev.

In the last few months I've had a used rear diff installed in place of my burnt original (vibration slightly lessened), two right side wheel bearings (slightly lessened again) and these tires (biggest difference).

Where should I be looking for this?

[MarcRogers]

Center support bearing? I was going to say unbalanced wheels but that's can't be in considering you had this problem with both sets on.


Sent from my iPhone using Tapatalk

[GOODBYNAAIR]

me things Bent wheel OEM wheels are soft.

[ElSabio182]

So the issue is present on the old tires and the new tires...but both sets of rubber are mounted on the same wheels? Maybe you're way beyond that in your diagnosis, but just to state the obvious: get your balance/alignment verified by a second shop and check the wheels for bends? One or two wheels with small bends would certainly fit the symptoms you're describing.