I had 27x12x12 mudlites on the back of mine the day i got it with no lift, as far as changing out the front tires it don't matter they are not going to be helping you. with the stock tires on the front the bike will be easier to turn.
I would think you would want the extra ground clearance and would go with a taller mud tire.I as far as changing out the front tires it don't matter they are not going to be helping you. with the stock tires on the front the bike will be easier to turn.