Hey first post here.
I have a 4x4 99 jimmy on stock wheels with 31x10.5 tires, I did have to take out some trim pieces and there is some rubbing if you hit a big dip while off-roading. No lift (yet). Will post pics later

I want to get some aftermarket wheels, but was hoping someone could help me out.

My question is would I be able to run 15x8s with 4.5 backspace? Or should I go with 0 bs and some kind of offset? Any feedback is appreciated

 

If you plan on either of those rims you will do a lot more than a little rubbing. Plan on taking chunks out of your tires and possibly causing some body damage.

 

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

You'll need to know the offset. For the 4wd blazers, the wheel offsets are 50 mm. https://www.wheel-size.com/size/chevrolet/blazer/1999/

 

Do you mean rubbing all the time? Or only when I’m driving through my field once in a blue moon?

 

Every time you turn the wheel or go over a speed bump.

 

Would 2in shackles and new torsion keys and a crank would prevent this? That is my plan of action for lifting. Where exactly would it rub?

 

Front bumper valance, top of the lip on the fender, base of fender at the front doors.

I had to beat the inside lip of the fender and trim the molding on the jimmy just to run 2wd offset rims and stock tires.

 

The torsion keys will help, but cause extra wear on the front end as it pushes it past the stock expectations... you'll be good on the rear with the shackles...

 

From what I've read, with a 2" suspension lift consisting of new rear shackles and a torsion-bar crank, 31" tires will rub the inside of the top of the fender opening and at the front and back corners of the fender opening. Also, with 31x10.5 tires on stock rims, the tires will also rub the frame rails when the steering wheel is at full crank. This later situation is likely a combination of the diameter and wider width.

With my lift (see below), the 30x9.5s on stock rims and no spacers has no clearance issues.

 

I already have and have had 31x10.5 tires. Woth very little trimming I’ve had no issues. My concern is would 15x8 rims with 4.75 bs cause any issues