I tried a Marathon 700x28 on my 2014 5.2. It barely cleared the brake caliper on the rear. I tried this to be able to ride gravel, dirt and crushed stone roads and trails. It seemed to work until just a tiny little pebble got caught between the tire & brake. And that was on a dry surface. I'm sure it would be almost unrideable on a wet surface when dirt, sand, small sticks etc. would likely stick to the tire.