I've got 27" Swamp Lites on my 2007 Foreman 500S and there is a slight loss of power felt and also a little trimming or fender heating required for fitting. I bent the front fender support bar to keep the fronts from rubbing and had to trim a little off the rear fender to keep them from rubbing as well. The front tires measured pretty close to 27"s, but the rears measured a little over 28"s. I could drop some air pressure to reduce the height, but I haven't done it yet.
You can kinda see the size difference in this broadside pic
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