Mt 325-50-15

Mounted on a 12 rim with 30lbs of air it's 13 3/4 section. I did call mt before I mounted them, they said a good rule of thumb is a 1/4 added to section width per inch of rim. The tires are advertised at 13.10 on a ten inch rim an he said to add a 1/4 to that for every inch wider I go with rim width. Any how it's pretty close to that. I'll add a couple of pics today to my gallery of them.