It is usually best to post generation specific questions, in the subforum specific to your generation of vehicle, where more owners of that generation will see it.
Do you have 18" or 20" rims? For 18" the largest seems to be 265/60/18, for 20" your size choices are more limited (unless tire manufacturer have recently made more than I'm aware of, assuming you want all terrain tire?) like 265/50/20 is the most common and I've seen one report of running 275/50/20, and here are pictures of that size on a 2011, and a few posts further down in that topic someone states they run 275/55/20 but that may be pushing it and remember that different make/model of tire may have variances in their actual diameter.
Hi All, New member and first time poster here. My wife is driving a '13 Limited with the 20" wheels. I was all set to replace the OEM Hankook Optimo's with a set of Michelin XLT M/S2 only to find that Michelin does not make that tire in the factory size of the Explorer with 20" package...
www.explorerforum.com
You may end up getting replies from two camps, one stating that you shouldn't go over 3% larger diameter, and another camp stating that it's not a a problem as long as it doesn't rub but you may then want to reprogram the speedometer (may only have choice of the largest factory tire offered to get as close as possible to the true vehicle speed)
What do you mean by aligned with the fender? The fender sticks out more on top then slopes inward at the bottom. It is unlikely that any tire wide enough to extend all the way past the fender at the top, won't rub. See the pictures in the topic linked above.