Wheel Trueness

[threejagsteve]

Has anyone checked the trueness of a number of wheels?

GYSM says the limit is 2mm out.

One I just checked is 0.8mm out; I'm wondering... Are they ever perfect, and how much is real-world noticeable?

TIA, and cheers! 

[the fan]

I have built /rebuilt several spoke wheels to within .020 (.5mm) without too much effort.

[threejagsteve]

Thanks, Bill;

I guess I should have been clear that I was talking about a cast wheel; however, I suppose that if within .5mm on a spoked wheel is good, then .8mm on a cast wheel likely isn't going to be too bad.