Depends how much wheel you want showing over tire, by this i mean how much you want the sidewall of the tire to protrude away from the wheel itself. A lot of crawlers or people who hit rocky trails (me) like a skinnier wheel because it provides more sidewall for the tire to grip with aiding in traction. If you go with a super wide wheel you will run into the issue of damage sometimes to the wheel from rubbing against items like rocks, curbs, etc. Currently im running a 315/75r16 (12.5" wide) tire on a 7" wide wheel which gives me lots of sidewall to grip with. Some people dont advise this because they believe that its too skinny a wheel for that wide of a tire, but they didnt get the name poor mans beadlocks for no reason. Another factor to take into consideration with wheel width is tred. The skinnier your wheel the less tred you will have on the pavement unless aired down lower than normal operating PSI's Having a wide wheel will grant you greater tred contact on the road.