I have to agree on that sweet Olds. Low, but not what I see as a "Lowrider".
That said, a lowrider doesn't necessarily have to have wire wheels or hydraulics. ,,, or even crazy paint for that matter.
The most famous lowrider of all,, the "Gypsy Rose" [both versions] originally rode on 5 spoke wheels. Either Cragar SS or Astro Supremes and as Martin says, lots of older ones use original or custom wheel covers.
IIRC, Gypsy Rose didn't even have hydraulics installed until sometime in the '80s.
I also see a lot of lows in single colors or factory style 2 tones instead of the wild multi-color paintjobs that are the expected style.
Seems that extreme lowness and white walls is a must though.
I may not be able to explain it very well but I know one when I build it.
So, I guess I'm in, I have a few more big Chevys to do.