Im looking to buy some wheels off a buddy, there 18 by 9 with the back spacing he says the backspacing is 4.75 and 0mm offset. my question is, whats the biggest tire I can run with these on a stock jk unlimited and will i need spacers since the offset is 0? Thanks!!

 

Go with some 33s and you should be ok. Spacers will fix any rubbing, if any, or a fender chop!

 

I had 33"with a tf leveling kit and when I disconnected I tires were all up in my fenders.

 

I wouldn't go larger than 33x12.50 at stock height. Maybe 325/60-18 (33x13.00) at the absolute most.