Join Date: Aug 2018
Location: Two locations in NH: One near Concord, the other at the 45th.
I ran 225/75-16s on my '08 Patriot. The 1st generation Compass and the Patriot are sister vehicles so I imagine the fender openings and tire clearance are at least similar if not identical. I did get a slight rub under extreme conditions, but that was rare. I didn't do any off-roading, but I drove on some pretty rough roads. Those tires came off my Wrangler so they were already worn some -- probably around the 29" zoner99 mentioned.
A decent shop ought to be able to advise you. A local guy might even do a trial fit. I think Discount Tire has a function on their website that will tell you how much oversize you can go.