They took the KM's that come stock on the Rubicon and made them better. I'm Running 35in KM2's right now, and once you get a Superchips your Jeep run a little better then it did with the stock KM's.

 

You are right for the 17s and 18s. I was looking at the 35x12.5R15. Not too many running 15's (a few, though).

 

Here are my new 37's next to my current 35's, love the KM2's!!!

 

Here's my new 37's, the last pic is this morning when I had my 35's on.

 

I love these. I have them in 35x12.5x17 they are amazing. I got mine siped. They are better in snow and ice than my stock bridgestone duelers were. they are the best mud tire I have ever owned as well. Memer kntr has had them in 37x12.5x17 and he loved them too! On the highway they are really quiet and really grippy too. wet pavement is amazing as well. These are the best all over tire ever (IMO). I would never give em up.