15x8" Rims, 3.75" Backspace 4WD S10 stock height blazer
 

So I just purchased 4 15x8" Rims with a -19mm offset. I've looked on every single forum I could find. No answers anywhere. My 2000 4WD blazer has no lift and I'm not sure if I need one. Right now I'm running 235/75R15's, and if I put these on, will they rub? If so, where, how bad, and what do I need to do? Any help at all would help alot!! I'm pulling out what little hair I have left looking for answers!
https://cimg9.ibsrv.net/gimg/blazerf...c58d5eb0b6.jpg

I'm not at my computer at the moment but my best memory is that the stock rims for the 4wd Blazers have an offset of 53 mm or about 2". For the 2wd I'm pretty sure the offset is 0 mm but I've also seen 13 mm.

Might this help?

Well now once those arrive, I'll be shipping them back and getting some Pacer 15x7", 4" backspacing. Once those show up, can I fit LT235/75R15's without rubbing or do I need to do some cutting? 🤔

You should be able to fit 30x9.5x15

Ummmm...4wd has 6" of backspacing, 2wd 4.5". Be happy if you can get away with the stock tires and no rubbing.

You might try this calculator: https://www.wheel-size.com/calc/

With a negative 19 mm offset, the center-line of the wheels will be 50 mm+19 mm = 69 mm ~ 2 3/4" further out. With an 8" rim over the stock 7" rim, that would add an additional 1/2" (half the difference) of the outer rim being further out.

Our wheel wells are pretty good sized but for reference (as mentioned above) the 30x9.5R15s should fit on an un-lifted Blazer.

What you will have with the -19 mm offset wheels over the +50 mm (or also quoted +53 mm) stock wheels for the 4wd Blazers ( where as zero offset for the 2wd ones as best I can find) is that the steering geometry will be off with the center of the point of contact of the tire being outboard from where the turning axis of the wheel intersects the ground. (This is called the "scrub radius".) It is apparently not good to have a scrub radius greater than zero or less than zero by maybe 1/2" to an inch either way although I have not been able to pin down how to determine what is too large or too small.

Well I just purchased some 15x7" 00 Offset rims, is it still possible to go with larger tires then stock, or am I stuck at stock size tires without a lift?

I'd use that sizing tool to help with answering that question by measuring the clearance (vertical and horizontal) for your stock wheels and tires that you have now. The 0mm offset will mean that the tires will be about 2" further out. Off the top of my head it could be fine but it depends on the size of the tires you install. Even with a lift, people generally need to roll the underside of the fender lip and cut out a little bit of the fender at the front and back when installing 31x10.5R15s.