on my 2001 slt , i think the rim size is 9x15 right?? will a 30/10/15 fit? i know there has been discussion about 30's fitting but what about the 10?? is that the width of rim ??

15x7

The tire size is probably 30/10.50/15, and yes, that will fit on a 15x7 wheel.

I dont think 30 inch tires can fit on a Jimmy with stock suspension unless its a ZR2. I could barely fit 235s in with minimun tire rub when I turn the wheel the whole way.

i put NOKIAN HAKKAPELIITTA SUV 235/75/15 no problem,no rub.. the truck calls for 70's"... how much bigger is a 30 than a 235??