I came across a free set of 30x11.50x15 tires for free but will the fit with my 15x7's or would I need wider wheels

 

You can run them on 15x7s just fine unless you have beadlocks I would stay with the narrower wheel so you can air down more with out worrying about loosing the bead.

 

I've run 35x12.50s on 7" rims without issue. Not sure what beadlocks have to do with anything though. My beadlocks are 15x8 and I run 38x12.50s on them.

 

alright sweet. I wonder how it's going to look with such wide tires lol

 

It's not that wide of a tire and the 7" rim will actually make it a bit taller and narrower.

 

Compared to my 225's it is haha. Also I don't have any flares so maybe it will give it a better stance. I wonder how it's going to play with my inner fenders on rocks though? Anyway I can't complain about some free super swampers

 

You'll be fine with the 7" wheels. I've got my 33x12.5 spare on a stock 15x7 steel wheel, and I've run up to 13.5" wide tires on a 7" wheel before with no problems.