I am planning on buying 20" 2011 Tahoe wheels for my 94 full size Blazer. I am planning on mounting 275x55R20 tires on them and of course adding some paint to them for a personal touch. My question is will they fit without any suspension mods or will I need to raise my suspension a little for proper steering and ride ?

 

How do you current tires compare to that size? If the overall diameter and width are pretty close then you shouldn't have much of a problem. A friend of mine has some H3 wheels on a 97 Tahoe (4dr version of yours basically) and they fit perfectly as far as offset and backspacing. He's running larger tires but has a 3" lift as well.

Here's a good site, you can type in your current and new tire sizes to see how closely they'll fit. Tire size calculator

 

I have 265/75R16 on it right now, and after checking out your link, it looks like a very good fit. The tire size calculator says there isn't much difference between the two sizes height and width overall. Thanks for the info.