Remember also that each tire manufacturer uses different rulers to determine tire diameter. So when you buy a 33" tire, they're often only 32.5 or less inches. I just bought some 35" tires
and they're only 34.8" in diameter, and that's brand new. Once they wear down some, well, you know.
The difference in clearance on my truck between 33" tires with 30% tread and 35" tires with 100% tread was closer to about 3 inches between the top of the tire and the body work on my truck.
So when switching from one manufacturer of 13" tire to another, make sure you measure so you can be aware of what the actual difference is.