I got a set of 18" rims pretty cheap, question is whats th max tire size I can run for the 18?? its a 2006 Megacab. Thanks in advance

 

i RUN 305/55/20,s ,about a 33 inch tire with no problem on stock susp.

 

backspacing has a big factor in that too.

 

Backspacing is definitely your issue... My old 18 inch American Racing Mojave wheels only had the equivalent of a 32.9" by 12" tire on them and they rubbed the back of the wheel well and the control arms while turning each way on level ground. I'v got 17's now with less offset and and a 33" 12.50" clears all day long... Check your backspacing. It's hard to find anything near stock, 6.25" I believe... That's why a lot of guys go with the Hummer wheels at 5.5" to run 34's and 35's