Interested if anyone else is experiencing the same issue I am....? I've got a 2LT with the (OEM) polished 17's and approx 1900miles on my HHR. I've always noticed a slight shimmy (or shake) when I approach the 55 - 60mph range.
Logically- took it to the dealer advising the front doesn't seem to pull one way or another (eliminating an alignment issue) and stating it only occured at a specific speed. Well - they pulled the wheels off and re-balanced stating they were 'all out of balance *a little*'! What exactly that means, I'm not sure- I always thought wheels were either IN balance or OUT... period!?
Well - turns out THAT wasn't the issue!!! Hell- I don't even think the dealer took the vehicle out for a test drive after balancing!?!?!
Curious if anyone else is, or has, experienced this issue with your HHR? I've wrenched on my fair share of vehicles over the years, and although I'm no mechanic- I'd like to think my dealer's NOT that cheap and incompetent (right ) !!!!!

 

Nope. No shaking with my HHR at well over 60.

 

alignment or balance usually causes that

shaking when braking is warped rotors

good luck

 

Mine rides like a Buick at 70 mph.

 

The other possible item... it shouldn't because their brand new......
tie rod ends or ball joints...

 

I think it's the Firestone tires. I noticed that shimmy when I hit around 60 MPH while the car is still warming up (a highway 1 mile from home). However after the tires got warm, the shimmy goes away.

 

I got rid of those tires long ago..
After the first encounter of the rain grooves and those tires going squirrelly ..

 

No shimmy at 60 but I do get one when I first start moving. I'm guessing the infamous warped rotors or wheels need balanced. I should be getting new wheels this weekend so I'll see if it still doing it.

Ng

 

Check your lugnut torque...When I did my springs and removed my wheels I noticed that the lugnuts were on barely above hand tight

Ng

 

Smooth as silk from 0-100, so far. Soon to be 0-100+