I am trying to figure out if my car (which I bought used) is at the factory ride height. I measured 26.5 " from ground to the edge of the fender lip going through the center of the wheel. I measured 25.5 on the fronts.

Seem like factory settings? I need new shocks at the rear...harsh ride over bumps and a slight bit of wandering when I hit low manhole covers, etc.

Looking at a pair of Bilstein sport shocks for the rears.

 

the measurement will vary based on the size of the tire you have

 

19s 295/30s on the rears

 

I have factory 18" wheels and fronts are 26 3/4, rears are 27 3/4

 

Whether There are 18s or 19s on the car wouldn't the rolling radius be the same if the tires are properly fitted?

 

Rolling radius and width vary between manufactures, even on the same size tires. Easiest way to tell if lowered would be to take a look at the springs. Should be able to tell pretty quick if they are aftermarket.

 

This. For the fronts you might be able to see by turning the wheel all the way to one side. Otherwise remove a wheel and inspect. Check your brake pads while you are in there too.