Hi guys.
Do I need spacers or pounding if I want to buy 245/75/16 tires for stock rims? I'm going to lift it 2'' too.

What is your vehicle, you did not state? Gas or diesel, it makes a big difference!
Lots of people willing to give advice on this forum, but will need more information to properly advise you in the best course of action....

Hi guys.
Do I need spacers or pounding if I want to buy 245/75/16 tires for stock rims? I'm going to lift it 2'' too.

Jeep Liberty 2003 3.7l Limited

Ok, let me rephrase and be as specific as I can.

I'm thinking about 245/75/16 or 255/70/16 on stock rims for Jeep Liberty 3.7 GAS which will be lifted 2'' on Ironman kit (springs, shock absorbers).
The car is only for town, road, no offroad whatsoever. It is my wife's baby.
It has been fully reconstructed (new panel, doors, chroms, paintwork, light-bar etc.) Looks like new! I want it to look as cool as possible 255's would look nicer I think.
If there will be some rubbing at a full turn (lock) - no problem I can live with that. But of course it can not rub on every single bump, let's be reasonable
Should I go for it? (rememeber - stock rims).

With your gasser, if you run these springs minus a clevis spacer you should be just fine with the 245x75R16's on stock wheels I would think since you have less engine weight.
But I certainly defer to any advice by TMud and / or TJ as they have lots of experience with raising gassers, tire selections, etc....

And 255/70/16? They are little bit wider but shorter. Does it mean they are riskier? YES!

245/75/16 -> 1.52 bigger, 0.39 wider than stock
255/70/16 -> 1.1 bigger, 0.79 wider than stock

The 255/70/16 wider tires will scrub more!
difference between 9.6" tread width versus 10" tread width!

I'm not that sure about that.
255/70-16 245/75-16 Difference
Diameter inches (mm) 30.06 (763.4) 30.47 (773.9) 0.41 (10.5) 1.4%
Width inches (mm) 10.04 (255) 9.65 (245) -0.39 (-10) -3.9%
Circum. inches (mm) 94.42 (2398.29) 95.72 (2431.28) 1.3 (32.99) 1.4%
Sidewall Height inches (mm) 7.03 (178.5) 7.23 (183.75) 0.21 (5.25) 2.9%
Revolutions per mile (km) 671.04 (416.96) 661.93 (411.31) -9.1 (-5.66) -1.4%
Diameter and circumpherence are bigger in 245.

So, I have a 2" lift, 1.5" spacers and run 245/70/16 tyres. I haven't pinched the weld, I don't get rubbing on it but I do get mild rubbing on the under front bumper at full lock with compressed front springs (happens off-road).

I was thinking of going "up one size" with tyres, either 245/75/16 or 255/70/16, but I am definite I will get rubbing unless I give up on the spacers (which I don't want to do since with them the car is more stable on-road) and pinch the weld, OR I do some serious trimming of the under front bumper (I don't want to do that either).

Also, calculations-wise, you need to take into account one additional measure. Think about the longest stick you can fit into the tyre (or the longest line that you can fit in a cylinder with the dimensions of the tyre) -- that's the length you need to fit in the wheel well under full articulation of the suspension. For 245/70/16, this length is 769mm, for 255/70/16 it's 784mm, and for 245/75/16 it's 795mm.

So, a 245/75/16 tyre will definitely rub more than a 255/70/16 tyre.

I believe that for 255/70/16 you will need to pinch the weld and possibly use rims (or stock rims and spacers) with an effective offset between 10 and 25 (that's backspacing between 4.5" and 5" on a 7" width).

That's why I'm still at 245/70/16

Also, calculations-wise, you need to take into account one additional measure. Think about the longest stick you can fit into the tyre (or the longest line that you can fit in a cylinder with the dimensions of the tyre) -- that's the length you need to fit in the wheel well under full articulation of the suspension. For 245/70/16, this length is 769mm, for 255/70/16 it's 784mm, and for 245/75/16 it's 795mm.

So, a 245/75/16 tyre will definitely rub more than a 255/70/16 tyre.