New Wheels And Tires

I am looking to buy some new wheels and tires for my 95 4runner and needed some info. Does anyone know biggest i can go width and diameter. i want to keep the wheels to 15 or 16. I was also wondering if anyone knows the bolt pattern. This is my first time buying new wheels so im kinda in the dark with the whole thing.

Discount tire says lug pattern 6-139.7 for a 1995, 4WD, SR5, just assumed.  Anyway ProComp has some nice wheels and tires.  31 is about the MAX I would run STOCK, leveling kit installed.  I dont know if 12.5 will be ok since you dont have a lift, someone else will have to chime in on that one.  There might be other opinions, thats just mine.