I thought of that, but I just put new rubber all the way around,

I can appreciate the hassel of going back to a tire shop, because something
doesn't feel right.  CV's perhaps could set up a vibration, but here are a few
suggestions you didn't address in your email.

> I'd wonder if the viberation was present before the new skins.  I've run
> across several "balanced tires" that were unforunately not round.  Here our
> local shop has the regualar spin balancer with an attached roller that
> reports the roundness of the tire.  .020 and the tire fails.  Most of the
> time they break the bead and spin the tire on the rim 180 degrees.

Some new tires still fail.  I've seen .075 on my cars and still have tire
monkeys tell me well, try it, you migh not notice.  My van is very noticable
to me if they get much over .030.

Lastly and this should be checked first is your rims.  That's right, not only
do our rims get out of round, but the runout can be off.  The rim will look
like it wobbles when rotated slowly on the balance machine.  Second the tire
can also have a runout problem, though I suspect these would be the least
likely culprit.

If you dont have a fancy machine, most shops will have a gizmo that allows a
dial type indicator to  verify an out of round tire.  It seems that .050 is a
ballpark standard to warrenty a Goodyear.

Lastly the viiberation could be a result from stiiffer tires and your just
feeling more of the road surface.  I've had a bad shock or marignal shock is
better term, give me the feeling that the tire is out of balance.

Hope these suggestions help somewhat.