My machine came with 26" tires.  My CForce 1000 ATV came with 27" tires.  I watched a video on YouTube where they mounted 30" on an 800 Trail and there was a little rub, so they dropped down to 28's.

In my three trail trips, my skid plates are working overtime and I want the machine taller, without a lift. 

I found these from Rocky Mountain....   29's.  Wonder if anyone has tried these on a ZForce Trail?  (Of course 29x9-14 on the front)

[2015 Z Force 800 53/Trail EPS]

29s will rub on the gen-1 trails...and the massive increase in rotational mass will take power that even re-clocking with sliders won't restore. Also be breaking more ball joints and tie rod ends.  As for power, the 800 engine only has so much to give. Now the gen-2s are a little different. You might get away with that much increase. What year is your trail? It helps us if you list your machines in your signature line.