Re: Larger tire no lift; offset
the rockstar xd's are 17 x 9 rims with a +35 offset?
If so, 265's should be fine for width. The guys with SRT rims (20x9, 35 offset) run up to 275's on the front. You may or may not be able to use chains at this width, but if its a snow tire, it may not matter. Your next issue is overall diameter. I assume you are setting up for "off road" style. Your desired tire is taller than stock, so you will come close to rubbing the hex nut tip from the Upper Control Arm ball joint. Much like the issue of width, as long as it doesn't touch, you should be fine. Many of us, including myself, like to have some clearance between moving parts that is not measured by the thickness of a business card, if you know what I mean. I have seen posts where guys cut the tip of the hex nut off for clearance. If you do that, remember that if you ever need to disconnect the UCA from the steering knuckle you will need to buy a new ball joint (assuming it is replaceable) or an entire UCA assembly. And why would you need to disconnect that joint your ask? Well if you want to change your coils or struts, of course, you'll need that nut tip for grip to tighten the ball joint back on. Just something to consider. I'm too tired to do the math for you, so you'll need to calculate the clearance, but I think your tire and wheel choice will be ok so far. Do a website search for your tire size, I'm sure someone else has tried this size before.
Offset, distance from center of the wheel to the hub measured in milimeters (mm). Roughly 1/4" = 6.35mm. This is handy for doing your own math.
Backspacing, distance from wheel hub to back edge of the wheel. Measured in inches.
Your 7.5" wide stock wheel should be offset 51mm (2"), and backspace 6 1/4" (8.5/2 = 4.25, +2 = 6.25). Wider Tire/wheel width can increase your backspacing. So a 9" wide rim, with offset 35, should have a backspace of 6 3/8" (10/2= 5, +1.375 = 6.375). Now remember, your tire adds to that backspacing too, so figure another 1/4 for a 265, so you are at 6 5/8". I'm not sure what the max is, but that's getting close to it.
Hopefully that helps a bit. I learned a lot preparing for my own Jeep to be lowered. When I started this stuff was mysterious to me too. )