I was trying to figure out the largest Wheel and Tire setup I could put under one without a bunch of work I was reading one thread on here it said that someone put twenties on there HHR is that correct

 

Not the size of the rim that counts but how tall the tire is.
26.3 inches is about the tallest that will fit. Any taller and they would hit/rub the lower strut perch.

Fwiw. Running 20 inch rims would require a very short sidewall tire. That would give you a very rough ride. If it's a daily driver car, 20's wouldn't be a good choice.

 

Hi Brian, to the forums!!

Here is a chart of overall tire diameters that may help you find that perfect size!
http://www.importtire.com/itphotos/doc-od-ref.pdf

 

The absolute physical limiting factor is interference with the lower spring perch on the front struts.

There are also safety concerns using any size other than came from the factory.

If somebody said they are running them on their car, I would tend to believe it, but I also believe the moon is made of bleu cheese.

 

Welcome to the site, I thought the moon was Swiss cheese? But , yeah, nothing over 26.3 inches tall

 

 

Nice, 20's!
Hmm I need taller tires, my 215/55R16's don't measure up!

 

these are not real big but they are perfect and they are cheaper than 20's......

check these out https://www.chevyhhr.net/forums/clas...ls-sale-58672/