Stock wheels, bigger tires

So ive searched and looked all over but cant really find an answer to this.. Ive got a 2014 sportsman 400 with stock wheels and am looking at new tires, probably zillas. My question, if I run a 26X9-12/ 26X11-12 or 27X9-12/ 27X11-12 will I need new wheels to fit these without rubbing anywhere? The fit between the stock tires and spindle already looks really tight