I just bought a 2001 wj and I was wanting to put tj rubicons on it the 16 inch(I already know I'll need adapters) and I'm really not familiar with metric but I just want to know what size tire I need. It has a budget boost and I don't want anything bigger then a 30 inch tire thanks.

With 16" Moabs you won't need adapters..the jk Moabs will require adapters (17s)

There are metric tire conversions all over the Internet.

I thought the tj rubicons were 5x4.5 and wj's were 5x5?

Your right.

I was thinking zj.

You posted in OEM Cherokee tech on Cherokee not in the gc section she we assume xj. To go on your wj you will need adapters