As Bmxer noted, 16's will work fine. KK's came with 16's, 17's, 18's and 20" wheels. The trick to making them work is that the outer tire diameter has to be about 29" to stay in the OEM range (and keep your speedometer & odometer reading accurately). Also, 7" wide rims with 4" back spacing is stock equivalent.

Thanks for catching the error, Bmx!

Jet models had larger brake rotors than other KK's. 17s are fine but 16s won't fit.

Hi Bmxer
I didn't "hear" about it, I went through it 12 months ago fitting wheels to my 2012 jet model.
Only point of contention is I am in Australia so I own a Cherokee not a Libby. So perhaps it's an international thing.
So were you able to fit 16's to your Jet? Would be interested to know what wheels if so?
Cheers
Bob

Are you diesel? That's the only thing I can think of. As Scar0 said, all North American KKs and KAs have the same size brakes.

On the KA forum I am a member of, the 2 I mentioned above were early year productions. But you never know what year end production oddities you will find. IE there was a "SLT" model KA with a 4.0 in it. Typically a "SLT" would have a 3.7. I also saw an SLT with an R/T exterior package...
Anyway,
Worse case you could always swap in smaller rotors, calipers, and brake pads. Only possible issues would be if the front half shaft is not the same, and/or if the rear drum-in-hat hand brake pads are also larger.
Guess it depends on just how bad you want to run 16's...
But it may save $ down the road to swap them out(when needed) instead of trying to find the larger rotors.

Hi
Not guys, not a diesel.
There has been the odd thread on wheel size specific to "jet" model kk's on the ausjeepoffroad forum too, so there are multiple instances of people wrestling with trying to unsuccessfully fit 16s to their jets down here.
Interestingly I understand that the very last of the kk sport production we received down here came standard with 17s so perhaps jeep had some larger rotors or calipers they needed to get rid of before the kk model ended. Perhaps they did that through the international market only?
Cheers