Good Afternoon Everyone;
Just a quick question after digging around this forum and getting a pretty good understanding of how Offset works to find a good set of wheels.

Currently have a 1992 E30 Cab., with the stock steel rims (14" x 6", ET33 from what I've read).

I'm looking at a set of Rims that are the correct 4x100 Bolt Pattern, they are 17" x 7", ET(Offset) 42mm, without changing anything if you plug that into the 1010Tires Offset Calculator, it spits back that they won't fit because of the high offset (22mm to close to the inside/struts). So in this case, would the best solution if I understand offset correctly, be to simply purchase a 15 or 20mm Offset Plate from H&R Springs, so that I'm only about 2mm closer to the inside, and about 18mm further out? My understanding is that I simply need this Offset Plate to push the wheels back out for a Final offset of about 27mm....

You got it, 15 or 20mm both should work. Bigger spacer more likely you'll contact the fender, but rolling your fenders isn't the hardest thing in the world. Either way with 215/40/17's 15 or 20mm should both work, i've used 17x7.5's with et43 and a 15mm spacer and 225/40's, didn't rub the inside, I rolled the outside as a precaution might not have been needed, but I was lowered you didn't mention what height youre at.

Thanks Mossman,
Aye, this is a fairly recent purchase, so for now it's not lowered at all, stock height with bottlecaps, I figure I'll take care of lowering etc. once I get some good Rims & Tires under it, as it'll take a while to save up for the lowering anyways.

That takes care of the question, now I just have to narrow down my selection from the various styles 1010Tires has that fit, to one I want to go with, 1010 seems to have a decent selection of 4x100's...

Thanks!

With the spacer you are also going to need longer lug bolts. With the 17X7 wheel and then the spacer I would stay on the narrow side with the tires. There is not a lot of room at the fender on the E30.