Re: Help with understanding wheel numbers
You can run anywhere from a half inch narrower to 1/2" wider and stay within the manufacturer's recommended rim width.
The important things to watch are the bolt pattern and offset. Jeep is 5x5 (5 bolts in a 5 inch diameter) and the offset is around 50mm positive. Wrong bolt pattern will not bolt up at all, wrong offset and the rims will either stick out from under the truck or tuck too far under. Too much of either and you will have problems with steering or if they tuck way too far under, they just won't clear the brakes and therefore, can't even bolt on.
Borla S catback.Stillens. BT catch can. Hemifever tune.