I tried 14" Rims with 26" tires on my Rhino. I didn't like the way the inside rear wheel would come off the ground in turns much more then with any 12" setup I've tried. I felt like I lost wheel travel as the ride was rougher even with radials due to less side wall. The setup only lasted a few rides as one of the tires was unrepairable and the rest weren't much better from all the side wall cuts. When the 14" rims came out I thought they were a great idea, but they are worthless for the way I ride.

Obviously some get away with using them, but I wouldn't get them unless I was mounting up some Silver Backs.