Tire size question

just put a 2 1/2 inch rough country lift on my truck. Wonted to know wat size off set rims and size tires would fit??????

 

if you search a little you can find out theres tons of these postings

 

im a new to this site so where do i look to find the answer . i luged my friends 285's on today but the damn tire was touchin the a arm or the sway bar one of the two. but i think with wider rims they would fit fine. like an off set rim. where should i look for this answer

 

what is that how do i go to it im new at this web site