kenavery7

<center><img src="http://pictureposter.audiworld.com/24630/picture_003.jpg"></center><p>It's smooth up to 70 though.. wierd.

Feels like something is not balanced out back.

I've heard of wheel bearings going on these cars.. could it be that?

There is an egg developing in my rear driver side tire, which probably isn't helping.

This isn't my tire, but it looks just like this.

changs4

what brand of the tire ?

C.O. Guy

bet you have a bent rim....

J4SON

Have them check the rim for bends, and balance it too.

ExpStang

Sounds like a bad tire or rim

golfrsi

that bubble will also throw the wheel off balance,,, esp. at 70 mph.

donp

Install spare tire NOW.

S4A4

It's because you have too much old dirt on your rim!!!

kenavery7

In fact, it's actually my spare rim.

My regular rim got scratched up, so I had my tire (from the first rim) put onto my spare.

I'm thinking that the bubble stretches at 70mph and creates that vibration.

kenavery7

PS- it's a Pirelli tire.