Not sure where made but yes 14". At least report the problem to NHTSA
http://www.nhtsa.gov
I am still looking at this (its kind of personal) and to bring back my question, are there more problems with the Marathon or are they so ubiquitous that statistically they will stick out because there are so many of them.
I just came across
http://www.tire-information-world.com/g ... tires.html and about half way down the page is a table that gives the static load radius. As an example for my tires 205/14 the distance from the center of the tire/hub to the ground should be 12.1 inches and if it is less than that you add air and if it is more than that you let air out (this is from the Goodyear literature.)
I will also be looking for this for the tires on my Subaru, I had a problem with the VDC being knocked out pulling the trailer and suspect too much tongue weigh gave enough pressure on the rear tires to fox the electronics. In future I will be checking load radius and getting it the same front to rear.
One of the things few of is do is think about balancing trailer tires and we should. the aforementioned trailer tire will rotate about 800 times in a mile vibrations in the form of an out of balance condition will not be good for the tires and you will not feel it. This is potentially a way to find a problem in a tire, belt broken or out of place, side wall bulge etc.